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GCSE Higher Maths Practice Questions: Grade 4 to 9

By Dr. Arash Ardalan, PhD in Mathematical Statistics, Founder of Ezymatics Tutoring

GCSE • July 2026

Original practice questions, written in the style and difficulty of recent Edexcel Higher tier papers. Each topic below is broken into individual grade sections — work through Grade 4 up to Grade 9 to see exactly how the difficulty steps up. Tap a question to reveal the worked answer.

Grade 4
1 mark

Q1. Round 3846 to the nearest 100.

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3800
1 mark

Q2. Round 6.5482 to 2 decimal places.

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6.55
1 mark

Q3. Round 0.0387 to 1 significant figure.

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0.04
2 marks

Q4. By rounding each number to 1 significant figure, estimate the value of 396 × 21.

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400 × 20 = 8000
1 mark

Q5. Write 5/8 as a decimal.

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0.625
2 marks

Q6. Write 0.45 as a fraction in its simplest form.

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0.45 = 45/100 = 9/20
3 marks

Q7. Write these in order, smallest first: 0.6, 5/8, 58%

Show answer
As decimals: 0.6, 0.625, 0.58. Order: 58%, 0.6, 5/8
2 marks

Q8. Find 35% of 220.

Show answer
0.35 × 220 = 77
2 marks

Q9. Increase 160 by 25%.

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160 × 1.25 = 200
1 mark

Q10. Work out 24.

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16
1 mark

Q11. Work out 30.

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1
1 mark

Q12. Write 5−1 as a fraction.

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1/5
2 marks

Q13. Write 84 as a product of prime factors.

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2² × 3 × 7
2 marks

Q14. Find the highest common factor (HCF) of 36 and 48.

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12
2 marks

Q15. Find the lowest common multiple (LCM) of 8 and 12.

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24
1 mark

Q16. Write 47,000 in standard form.

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4.7 × 104
1 mark

Q17. Write 3.2 × 103 as an ordinary number.

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3200
Grade 5
1 mark

Q18. Round 128,469 to 3 significant figures.

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128,000
2 marks

Q19. By rounding each number to 1 significant figure, estimate the value of (812 × 0.48) ÷ 19.6.

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(800 × 0.5) ÷ 20 = 20
1 mark

Q20. Convert 7/20 to a percentage.

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35%
3 marks

Q21. A shirt costs £24. It is reduced by 30% in a sale. Find the new price.

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24 × 0.7 = £16.80
3 marks

Q22. In a survey of 180 people, 45% prefer tea to coffee. How many people prefer tea?

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0.45 × 180 = 81 people
2 marks

Q23. Find 3/5 of 240.

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144
1 mark

Q24. Write 4−2 as a fraction.

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1/16
2 marks

Q25. Simplify, leaving your answer as a power of 2: 25 × 23

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28
2 marks

Q26. Simplify: 37 ÷ 34

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33 = 27
2 marks

Q27. Write 96 as a product of prime factors.

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25 × 3
2 marks

Q28. Find the HCF of 60 and 84.

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12
3 marks

Q29. Find the LCM of 6, 8 and 10.

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120
2 marks

Q30. Write 0.000063 in standard form.

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6.3 × 10−5
1 mark

Q31. Write 2.5 × 106 as an ordinary number.

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2,500,000
3 marks

Q32. Work out (2 × 103) × (3 × 102), giving your answer as an ordinary number.

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2 × 3 = 6; 103 × 102 = 105. Total: 600,000
2 marks

Q33. A recipe uses 250g of flour for 4 people. How much flour is needed for 10 people?

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250 ÷ 4 × 10 = 625 g
2 marks

Q34. Which is bigger, 3/7 or 0.43? Show your working.

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3/7 ≈ 0.4286, so 0.43 is bigger.
Grade 6
3 marks

Q35. Work out (4 × 104) × (5 × 10−2). Give your answer in standard form.

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4 × 5 = 20 = 2 × 101; 104 × 10−2 = 102. Total: 2 × 103
3 marks

Q36. Work out (6 × 10−3) ÷ (3 × 102). Give your answer in standard form.

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6 ÷ 3 = 2; 10−3 ÷ 102 = 10−5. Answer: 2 × 10−5
2 marks

Q37. Simplify: √48

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4√3
3 marks

Q38. Simplify: √27 + √12

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3√3 + 2√3 = 5√3
3 marks

Q39. Simplify: √63 − √28

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3√7 − 2√7 = √7
1 mark

Q40. Work out: (√5)²

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5
2 marks

Q41. Multiply and simplify: √3 × √12

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√36 = 6
2 marks

Q42. Evaluate: 82/3

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(cube root of 8)² = 2² = 4
1 mark

Q43. Evaluate: 251/2

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5
2 marks

Q44. Evaluate: 9−1/2

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1/3
2 marks

Q45. Convert the recurring decimal 0.444... to a fraction in its simplest form.

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4/9
3 marks

Q46. Convert the recurring decimal 0.2777... to a fraction in its simplest form.

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Let x = 0.2777... Then 100x − 10x = 25 ⇒ 90x = 25 ⇒ x = 5/18
1 mark

Q47. A length is measured as 12cm to the nearest cm. Write the error interval for the true length, l.

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11.5 ≤ l < 12.5
1 mark

Q48. A mass is recorded as 3.6kg to 1 decimal place. State the upper bound of the true mass.

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3.65 kg
1 mark

Q49. Round 458.372 to 2 significant figures.

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460
2 marks

Q50. By rounding each number to 1 significant figure, estimate the value of (198 × 5.1) ÷ 9.8.

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(200 × 5) ÷ 10 = 100
2 marks

Q51. Simplify fully: √8 × √2

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√16 = 4
Grade 7
3 marks

Q52. Work out (2.4 × 105) × (5 × 103). Give your answer in standard form.

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2.4 × 5 = 12 = 1.2 × 101; powers: 105 × 103 = 108. Total: 1.2 × 109
3 marks

Q53. Work out (9 × 107) ÷ (3 × 104). Give your answer in standard form.

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9 ÷ 3 = 3; 107 ÷ 104 = 103. Answer: 3 × 103
3 marks

Q54. Without using a calculator, work out (3 × 10−2) × (2 × 10−3). Give your answer in standard form.

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3 × 2 = 6; 10−2 × 10−3 = 10−5. Answer: 6 × 10−5
2 marks

Q55. Simplify fully: √200

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10√2
3 marks

Q56. Simplify fully: 3√5 × 2√10

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6√50 = 6 × 5√2 = 30√2
3 marks

Q57. Expand and simplify: (2+√3)(2−√3)

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4 − 3 = 1
2 marks

Q58. Solve: 2x = 32

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x = 5
2 marks

Q59. Solve: 5x = 1/25

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x = −2
2 marks

Q60. Evaluate: 163/4

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(4th root of 16)³ = 2³ = 8
2 marks

Q61. Evaluate: 27−2/3

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(cube root of 27)−2 = 3−2 = 1/9
3 marks

Q62. Convert the recurring decimal 0.1666... to a fraction in its simplest form.

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Let x = 0.1666... 100x − 10x = 15 ⇒ 90x = 15 ⇒ x = 1/6
1 mark

Q63. A number, n, rounds to 7.2 to 1 decimal place. Write the error interval for n.

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7.15 ≤ n < 7.25
3 marks

Q64. Two lengths are 6.4cm and 3.2cm, both measured to 1 decimal place. Find the lower bound for their sum.

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6.35 + 3.15 = 9.5 cm
1 mark

Q65. Round 0.049837 to 2 significant figures.

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0.050
2 marks

Q66. By rounding to 1 significant figure, estimate the value of 5.2³.

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5³ = 125
2 marks

Q67. Write 0.0000082 in standard form.

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8.2 × 10−6
Grade 8
2 marks

Q68. Rationalise the denominator and simplify: 5/√5

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5/√5 = 5√5/5 = √5
3 marks

Q69. Rationalise the denominator and simplify: 3/(2√3)

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3√3/6 = √3/2
4 marks

Q70. Rationalise the denominator and simplify: 4/(√7−2)

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Multiply by (√7+2): denominator = 7−4 = 3. Result: (4√7+8)/3
4 marks

Q71. Rationalise the denominator and simplify: 10/(3+√7)

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Multiply by (3−√7): denominator = 9−7 = 2. Result: 15 − 5√7
3 marks

Q72. Expand and simplify, giving your answer in the form a+b√2: (3+√2)(1−√2)

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3 − 3√2 + √2 − 2 = 1 − 2√2
3 marks

Q73. Expand and simplify: (√5+3)²

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5 + 6√5 + 9 = 14 + 6√5
4 marks

Q74. A rectangle has sides 5.5cm and 3.2cm, both measured to 1 decimal place. Find the upper bound of the perimeter.

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Upper bounds: 5.55, 3.25. Perimeter = 2(5.55+3.25) = 17.6 cm
4 marks

Q75. A speed is calculated as distance ÷ time, where distance = 100m (to the nearest m) and time = 9.8s (to 1 d.p.). Find the upper bound of the speed, to 2 decimal places.

Show answer
Upper distance = 100.5, lower time = 9.75. Speed = 100.5 ÷ 9.75 ≈ 10.31 m/s
2 marks

Q76. Leaving your answer in terms of π, find the area of a circle with radius 6cm.

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π(6)² = 36π cm²
2 marks

Q77. Leaving your answer in terms of π, find the circumference of a circle with diameter 14cm.

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π × 14 = 14π cm
4 marks

Q78. A car depreciates by 12% each year. If it is worth £18,000 now, find its value after 3 years, to the nearest £100.

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18000 × 0.88³ = 12,266.50... ≈ £12,300
3 marks

Q79. A population of bacteria doubles every hour, starting at 500. Find the population after 5 hours.

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500 × 25 = 16,000
2 marks

Q80. Simplify fully: √2 + √8

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√2 + 2√2 = 3√2
2 marks

Q81. Simplify fully: √45 ÷ √5

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√9 = 3
2 marks

Q82. Write √72 in the form a√2, where a is an integer.

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6√2
2 marks

Q83. Expand and simplify: (4−√3)(4+√3)

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16 − 3 = 13
Grade 9
4 marks

Q84. Rationalise the denominator and simplify fully, giving your answer in the form a+b√3: (2+√3)/(2−√3)

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Multiply by (2+√3): (2+√3)²/(4−3) = (2+√3)² = 4+4√3+3 = 7+4√3
4 marks

Q85. Rationalise the denominator and simplify fully: (√5−1)/(√5+1)

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Multiply by (√5−1): (√5−1)²/(5−1) = (6−2√5)/4 = (3−√5)/2
4 marks

Q86. Simplify fully, giving your answer in the form a+b√2: (1+√2)³

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(1+√2)² = 3+2√2. (3+2√2)(1+√2) = 3+3√2+2√2+4 = 7+5√2
4 marks

Q87. A cuboid has dimensions 4.5cm, 3.2cm and 2.1cm, all measured to 1 decimal place. Find the upper bound of the volume, to 3 significant figures.

Show answer
Upper bounds: 4.55, 3.25, 2.15. Volume = 4.55 × 3.25 × 2.15 = 31.79... ≈ 31.8 cm³
4 marks

Q88. A triangle has area 24.5cm² (to 1 d.p.) and base 7.2cm (to 1 d.p.). Using Area = ½ × base × height, find the lower bound of the height, to 3 significant figures.

Show answer
To minimise height: lower area (24.45), upper base (7.25). h = 2 × 24.45 ÷ 7.25 ≈ 6.74 cm
2 marks

Q89. Leaving your answer in terms of π and in its simplest form, find the volume of a sphere with radius 3cm (V = 4/3 πr³).

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4/3 π(27) = 36π cm³
3 marks

Q90. Leaving your answer in terms of π, find the total surface area of a cylinder with radius 4cm and height 10cm (2πr²+2πrh).

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2π(16)+2π(4)(10) = 32π+80π = 112π cm²
3 marks

Q91. A quantity P increases by 8% each year, compounding. Starting at P=2000, write an expression for P after n years.

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P = 2000 × 1.08n
4 marks

Q92. A radioactive substance decays by 15% every hour. If there is 800g initially, find the mass remaining after 6 hours, to 3 significant figures.

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800 × 0.856 = 301.7... ≈ 302 g
3 marks

Q93. Simplify fully: √3(√12+√27)

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√36+√81 = 6+9 = 15
3 marks

Q94. Simplify fully: (2√3)4

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24 × (√3)4 = 16 × 9 = 144
3 marks

Q95. Write in the form k√2: √50+√8−√18

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5√2+2√2−3√2 = 4√2
2 marks

Q96. Prove that (√2+1)(√2−1)=1.

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Expanding: 2−√2+√2−1 = 2−1 = 1, as required.
3 marks

Q97. A ball is dropped and bounces to 75% of its previous height each time. If dropped from 4m, find the height after the 4th bounce, to 2 decimal places.

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4 × 0.754 = 1.27 m (2 d.p.)
2 marks

Q98. Two similar containers have volumes in the ratio 8:27. Find the ratio of their corresponding lengths.

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Cube root of 8 : cube root of 27 = 2 : 3
4 marks

Q99. Given that x = 3+2√2, find x + 1/x, giving your answer in its simplest form.

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1/x = (3−2√2)/(9−8) = 3−2√2. So x+1/x = (3+2√2)+(3−2√2) = 6
3 marks

Q100. Simplify fully: (5+√3)(5−√3) − (√3)²

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(25−3)−3 = 22−3 = 19
Grade 4
2 marks

Q101. Solve: 4x+7=23

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x = 4
2 marks

Q102. Solve: 3(x−2)=15

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3x−6=15 ⇒ x = 7
2 marks

Q103. Solve: 5x−3=2x+12

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3x=15 ⇒ x = 5
1 mark

Q104. Expand: 3(2x+5)

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6x + 15
1 mark

Q105. Expand: −2(3x−4)

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−6x + 8
2 marks

Q106. Factorise: 6x+9

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3(2x+3)
2 marks

Q107. Factorise: x²+5x

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x(x+5)
1 mark

Q108. Simplify: 3a+5b−a+2b

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2a + 7b
2 marks

Q109. Find the value of 2x²+1 when x=3.

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2(9)+1 = 19
3 marks

Q110. Solve the simultaneous equations: x+y=10, x−y=2

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Adding: 2x=12 ⇒ x=6, then y=4. x=6, y=4
2 marks

Q111. Find the nth term of the sequence: 2, 5, 8, 11, ...

Diagram for Q111
Show answer
Common difference 3. nth term = 3n − 1
1 mark

Q112. Using the sequence 2, 5, 8, 11,... (nth term 3n−1), find the 15th term.

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3(15)−1 = 44
2 marks

Q113. Solve: x/3 + 2 = 7

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x = 15
1 mark

Q114. Find the gradient of the line y=4x−3.

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4
1 mark

Q115. Find the y-intercept of the line y=4x−3.

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−3 (i.e. (0, −3))
3 marks

Q116. Solve: 2(x+3)=3(x−1)

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2x+6=3x−3 ⇒ x = 9
1 mark

Q117. Simplify: 4x² × 3x

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12x³
Grade 5
4 marks

Q118. Solve the simultaneous equations: 3x+y=14, x−y=2

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Adding: 4x=16 ⇒ x=4, then y=2. x=4, y=2
4 marks

Q119. Solve the simultaneous equations: 2x+3y=16, x+y=7

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From the 2nd equation, x=7−y. Substituting: y=2, then x=5. x=5, y=2
2 marks

Q120. Expand: (x+3)(x+5)

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x² + 8x + 15
2 marks

Q121. Expand: (x−2)(x+7)

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x² + 5x − 14
2 marks

Q122. Factorise: x²+7x+10

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(x+2)(x+5)
2 marks

Q123. Factorise: x²−9

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(x−3)(x+3)
2 marks

Q124. Solve: x²=49

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x = ±7
2 marks

Q125. Find the nth term of the sequence: 7, 4, 1, −2, ...

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Common difference −3. nth term = 10 − 3n
2 marks

Q126. Using the sequence with nth term 10−3n, find which term equals −20.

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10−3n=−20 ⇒ n = 10 (the 10th term)
2 marks

Q127. Make x the subject: y=3x+4

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x = (y−4)/3
2 marks

Q128. Simplify: (2x³)²

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4x6
2 marks

Q129. Simplify: 12x4/4x²

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3x²
2 marks

Q130. Solve the inequality: 2x+3<11

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x < 4
2 marks

Q131. Solve the inequality: 5−x≥2

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−x≥−3 ⇒ x ≤ 3
2 marks

Q132. Find the equation of a line with gradient 3 passing through (0,−2).

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y = 3x − 2
2 marks

Q133. A line has equation y=2x+5. State its gradient and y-intercept.

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Gradient = 2, y-intercept = 5
3 marks

Q134. The graph shows a straight line passing through (0,1) and (4,9). Find (a) the gradient (b) the equation of the line.

Diagram for Q134
Show answer
Gradient = (9−1)/(4−0) = 2. Using (0,1) as the y-intercept: y = 2x + 1
Grade 6
3 marks

Q135. Solve by factorising: x²+6x+8=0

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(x+2)(x+4)=0 ⇒ x = −2 or x = −4
3 marks

Q136. Solve by factorising: x²−3x−10=0

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(x−5)(x+2)=0 ⇒ x = 5 or x = −2
3 marks

Q137. Solve by factorising: x²−8x+16=0

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(x−4)²=0 ⇒ x = 4 (repeated root)
4 marks

Q138. Solve by factorising: 2x²+5x−3=0

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(2x−1)(x+3)=0 ⇒ x = 1/2 or x = −3
2 marks

Q139. Expand: (x+4)²

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x² + 8x + 16
2 marks

Q140. Expand: (2x−3)²

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4x² − 12x + 9
2 marks

Q141. Find the nth term of the sequence: 4, 9, 14, 19, ...

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Common difference 5. nth term = 5n − 1
4 marks

Q142. Solve the simultaneous equations: y=x+1, y=x²−5

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x+1 = x²−5 ⇒ x²−x−6=0 ⇒ (x−3)(x+2)=0. x=3, y=4 or x=−2, y=−1
2 marks

Q143. Make y the subject: 2x+3y=12

Show answer
y = (12−2x)/3
2 marks

Q144. Simplify: (3x²y)(2xy³)

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6x³y4
2 marks

Q145. Solve the inequality and represent your answer using inequality notation: 3x−2≤10

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x ≤ 4
3 marks

Q146. The curve y=(x−2)(x+4) crosses the axes. State its roots and its y-intercept.

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Roots: x = 2 and x = −4. y-intercept (at x=0): (−2)(4) = −8
2 marks

Q147. Factorise fully: 3x²+12x

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3x(x+4)
2 marks

Q148. Factorise fully: 4x²−25

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(2x−5)(2x+5)
3 marks

Q149. Simplify fully: (x²−9)/(x+3)

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(x−3)(x+3)/(x+3) = x − 3
4 marks

Q150. Solve x²+2x−1=0 using the quadratic formula, giving your answers to 2 decimal places.

Show answer
x = (−2 ± √8)/2 = −1 ± √2. x ≈ 0.41 or x ≈ −2.41
3 marks

Q151. A geometric sequence has first term 3 and common ratio 2: 3, 6, 12, 24, ... Find the 6th term.

Show answer
3 × 25 = 96
Grade 7
4 marks

Q152. Solve by factorising: 3x²+11x+6=0

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(3x+2)(x+3)=0 ⇒ x = −2/3 or x = −3
4 marks

Q153. Solve x²−4x−1=0 using the quadratic formula, giving your answers to 2 decimal places.

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x = (4 ± √20)/2 = 2 ± √5. x ≈ 4.24 or x ≈ −0.24
4 marks

Q154. For the graph y=x²−2x−8: find the coordinates where it crosses the x-axis and the coordinates of the turning point.

Diagram for Q154
Show answer
(x−4)(x+2)=0 ⇒ roots (4,0) and (−2,0). Turning point at x=1: y=1−2−8=−9, so (1, −9)
2 marks

Q155. Solve the inequality: x²<16

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−4 < x < 4
2 marks

Q156. Solve the inequality: x²≥25

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x ≤ −5 or x ≥ 5
5 marks

Q157. Solve the simultaneous equations: y=2x−1, y=x²−4x+7

Show answer
2x−1 = x²−4x+7 ⇒ x²−6x+8=0 ⇒ (x−2)(x−4)=0. x=2, y=3 or x=4, y=7
4 marks

Q158. Find the nth term of the quadratic sequence: 2, 7, 14, 23, 34, ...

Show answer
2nd difference = 2 ⇒ coefficient of n² is 1. Comparing terms: nth term = n² + 2n − 1
3 marks

Q159. Write as a single fraction: (2x−1)/x + 3

Show answer
(5x−1)/x
3 marks

Q160. Write as a single fraction: 1/(x+1) + 1/(x−1)

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2x/(x²−1)
4 marks

Q161. Make x the subject: y = (2x+1)/(x−3)

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y(x−3)=2x+1 ⇒ x(y−2)=3y+1 ⇒ x = (3y+1)/(y−2)
3 marks

Q162. Factorise fully: x³−4x

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x(x²−4) = x(x−2)(x+2)
3 marks

Q163. Simplify fully: (x²+5x+6)/(x+2)

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(x+2)(x+3)/(x+2) = x + 3
2 marks

Q164. Solve: 2x+1=16

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2x+1=24x = 3
2 marks

Q165. Solve: 32x=81

Show answer
32x=34x = 2
1 mark

Q166. f(x) = 2x+3. Find f(5).

Show answer
13
3 marks

Q167. A geometric sequence has first term 5 and common ratio 3. Find an expression for the nth term, and use it to find the 5th term.

Show answer
nth term = 5 × 3n−1. 5th term: 5 × 34 = 405
Grade 8
3 marks

Q168. Write x²+8x+3 in the form (x+a)²+b.

Show answer
(x+4)² − 13
4 marks

Q169. Solve x²−6x+2=0 by completing the square, giving exact answers.

Show answer
(x−3)²−7=0 ⇒ (x−3)²=7 ⇒ x = 3 ± √7
5 marks

Q170. Solve: 1/(x+2) + 2/(x−3) = 1

Show answer
(x−3)+2(x+2) = (x+2)(x−3) ⇒ x²−4x−7=0 ⇒ x = 2 ± √11
3 marks

Q171. Given f(x)=x²−1 and g(x)=2x+3, find fg(x).

Diagram for Q171
Show answer
f(g(x)) = (2x+3)²−1 = 4x² + 12x + 8
3 marks

Q172. Given f(x)=x²−1 and g(x)=2x+3, find gf(x).

Show answer
g(f(x)) = 2(x²−1)+3 = 2x² + 1
3 marks

Q173. Given f(x)=3x−2, find f−1(x).

Diagram for Q173
Show answer
y=3x−2 ⇒ x=(y+2)/3. f−1(x) = (x+2)/3
2 marks

Q174. The curve y=f(x) is transformed to y=f(x)+4. Describe the transformation.

Show answer
Translation 4 units up (vector (0,4))
2 marks

Q175. The curve y=f(x) is transformed to y=f(x−2). Describe the transformation.

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Translation 2 units right (vector (2,0))
4 marks

Q176. Find the nth term of the quadratic sequence: 6, 11, 18, 27, 38, ...

Show answer
2nd difference = 2. nth term = n² + 2n + 3
3 marks

Q177. The iteration x_(n+1) = √(3x_n+1) is used with x_0=2. Find x_1 and x_2, to 3 decimal places.

Show answer
x_1 = √7 ≈ 2.646; x_2 = √(3×2.646+1) ≈ 2.990
3 marks

Q178. Simplify fully: (x²−4)/(x²+x−6)

Show answer
(x−2)(x+2)/[(x+3)(x−2)] = (x+2)/(x+3)
4 marks

Q179. Solve x²+3x−2=0 using the quadratic formula, giving your answers to 2 decimal places.

Show answer
x = (−3 ± √17)/2. x ≈ 0.56 or x ≈ −3.56
5 marks

Q180. Solve the simultaneous equations: x²+y²=25, y=x+1

Show answer
x²+(x+1)²=25 ⇒ x²+x−12=0 ⇒ (x+4)(x−3)=0. x=−4, y=−3 or x=3, y=4
3 marks

Q181. Factorise fully: 2x²−x−6

Show answer
(2x+3)(x−2)
4 marks

Q182. Write as a single fraction: 3/(x−1) − 2/(x+1)

Show answer
(x+5)/(x²−1)
2 marks

Q183. A sequence is defined by a_(n+1)=2a_n−3, with a_1=5. Find a_2 and a_3.

Show answer
a_2 = 2(5)−3 = 7; a_3 = 2(7)−3 = 11
Grade 9
5 marks

Q184. Solve: 2/(x−1) − 3/(x+2) = 1

Show answer
2(x+2)−3(x−1) = (x−1)(x+2) ⇒ x²+2x−9=0 ⇒ x = −1 ± √10
4 marks

Q185. Find the nth term of the quadratic sequence: 1, 6, 15, 28, 45, ...

Show answer
2nd difference = 4 ⇒ coefficient of n² is 2. nth term = 2n² − n
4 marks

Q186. Given f(x) = (x+1)/(x−2), find f−1(x).

Show answer
y(x−2)=x+1 ⇒ x(y−1)=2y+1 ⇒ f−1(x) = (2x+1)/(x−1)
4 marks

Q187. Given f(x)=x²+2 and g(x)=x−3, solve fg(x)=11.

Show answer
(x−3)²+2=11 ⇒ (x−3)²=9 ⇒ x = 6 or x = 0
4 marks

Q188. The iteration x_(n+1) = √(2x_n+3) is used with x_0=2. Find x_3, to 3 decimal places.

Show answer
x_1 ≈ 2.646, x_2 ≈ 2.879, x_3 ≈ 2.960
1 mark

Q189. The graph of y=f(x) passes through (3,7). State a point on the graph of y=f(x)−2.

Diagram for Q189
Show answer
(3, 5)
2 marks

Q190. The graph of y=f(x) passes through (3,7). State a point on the graph of y=f(x+1).

Diagram for Q190
Show answer
(2, 7)
1 mark

Q191. The graph of y=f(x) passes through (3,7). State a point on the graph of y=2f(x).

Diagram for Q191
Show answer
(3, 14)
3 marks

Q192. Solve x²−5x+2=0, giving your answer in surd form.

Show answer
x = (5 ± √17)/2
3 marks

Q193. Prove algebraically that the sum of two consecutive odd numbers is always even.

Show answer
Let the numbers be 2n+1 and 2n+3. Sum = 4n+4 = 4(n+1), which is even for all integers n. Shown.
4 marks

Q194. Solve: (x+1)/(x−1) = (x−2)/(x+3)

Show answer
Cross-multiplying: x²+4x+3 = x²−3x+2 ⇒ 7x=−1 ⇒ x = −1/7
5 marks

Q195. Solve the simultaneous equations: y=x²−2x, y=3x−4

Show answer
x²−2x = 3x−4 ⇒ x²−5x+4=0 ⇒ (x−1)(x−4)=0. x=1, y=−1 or x=4, y=8
3 marks

Q196. Prove algebraically that (n+1)²−n² is always odd for positive integers n.

Show answer
(n+1)²−n² = 2n+1, which is one more than an even number, so is always odd. Shown.
4 marks

Q197. Solve: x4−5x²+4=0

Show answer
Let y=x²: y²−5y+4=0 ⇒ (y−1)(y−4)=0 ⇒ y=1 or 4. x = ±1, ±2
3 marks

Q198. Simplify fully: (2x²−8)/(x²−4x+4)

Show answer
2(x−2)(x+2)/(x−2)² = 2(x+2)/(x−2)
5 marks

Q199. Solve the simultaneous equations: x²+y²=13, x+y=5

Show answer
y=5−x: x²+(5−x)²=13 ⇒ x²−5x+6=0 ⇒ (x−2)(x−3)=0. x=2, y=3 or x=3, y=2
3 marks

Q200. The graph shows y=x² (dashed) and a translation of it (solid). Write down the equation of the translated graph.

Diagram for Q200
Show answer
Translated 2 units right and 3 units up (vertex moves from (0,0) to (2,3)). New equation: y = (x−2)² + 3
Grade 4
2 marks

Q201. Share £200 in the ratio 3:2. Find the larger share.

Show answer
Total parts = 5. 3/5 × 200 = £120
1 mark

Q202. Simplify the ratio 15:25.

Show answer
3:5
1 mark

Q203. Simplify the ratio 24:36.

Show answer
2:3
2 marks

Q204. A recipe needs flour and sugar in the ratio 5:2. If 10kg of flour is used, how much sugar is needed?

Show answer
2/5 × 10 = 4 kg
1 mark

Q205. Find 20% of 150.

Show answer
30
1 mark

Q206. Find 60% of 45.

Show answer
27
2 marks

Q207. Increase 80 by 10%.

Show answer
80 × 1.1 = 88
2 marks

Q208. Decrease 120 by 15%.

Show answer
120 × 0.85 = 102
2 marks

Q209. A car travels 150 miles in 3 hours. Find its average speed.

Show answer
150 ÷ 3 = 50 mph
1 mark

Q210. Convert 2.5 hours into minutes.

Show answer
150 minutes
3 marks

Q211. A map has scale 1:50,000. A distance on the map is 4cm. Find the real distance in km.

Show answer
4 × 50,000 = 200,000 cm = 2 km
3 marks

Q212. Share £84 between two people in the ratio 4:3. Find each share.

Show answer
Total parts = 7. 4/7 × 84 = £48 and 3/7 × 84 = £36
1 mark

Q213. Write the ratio 8:12 in its simplest form.

Show answer
2:3
2 marks

Q214. 3 pens cost £2.40. Find the cost of 5 pens.

Show answer
2.40 ÷ 3 × 5 = £4.00
2 marks

Q215. A car uses 6 litres of petrol to travel 84km. How far can it travel on 10 litres?

Show answer
84 ÷ 6 × 10 = 140 km
1 mark

Q216. Find 45% of 80.

Show answer
36
3 marks

Q217. Share 60 sweets in the ratio 1:2:3. Find the largest share.

Show answer
Total parts = 6. 3/6 × 60 = 30 sweets
Grade 5
3 marks

Q218. Share £360 in the ratio 2:3:4. Find the middle share.

Show answer
Total parts = 9. 3/9 × 360 = £120
3 marks

Q219. A photo measuring 10cm by 15cm is enlarged by scale factor 3/2. Find the new dimensions.

Show answer
15 cm × 22.5 cm
3 marks

Q220. Find the original price if, after a 20% discount, an item costs £48.

Show answer
48 ÷ 0.8 = £60
3 marks

Q221. Find the original price if, after a 15% increase, a price becomes £69.

Show answer
69 ÷ 1.15 = £60
3 marks

Q222. Two numbers are in the ratio 5:7 and their sum is 96. Find the two numbers.

Show answer
Total parts = 12. 40 and 56
3 marks

Q223. A train travels 240km in 3 hours. Find its speed in km/h.

Show answer
240 ÷ 3 = 80 km/h
2 marks

Q224. A recipe for 6 people uses 300g of rice. How much rice is needed for 15 people?

Show answer
300 ÷ 6 × 15 = 750 g
1 mark

Q225. Convert 0.75 hours to minutes.

Show answer
45 minutes
2 marks

Q226. A car uses fuel at a rate of 8km per litre. How many litres are needed for a 200km journey?

Show answer
200 ÷ 8 = 25 litres
2 marks

Q227. £500 is invested for 1 year at 4% simple interest. Find the interest earned.

Show answer
500 × 0.04 = £20
2 marks

Q228. Find 3/8 of £96.

Show answer
£36
3 marks

Q229. Divide £150 in the ratio 1:2:2.

Show answer
Total parts = 5. £30, £60, £60
3 marks

Q230. A map scale is 1:25,000. Find the real distance, in km, represented by 6cm on the map.

Show answer
6 × 25,000 = 150,000 cm = 1.5 km
2 marks

Q231. Two lengths are in the ratio 3:5. If the shorter is 21cm, find the longer.

Show answer
21 ÷ 3 × 5 = 35 cm
2 marks

Q232. A rectangle has length:width ratio 4:3 and length 20cm. Find its width.

Show answer
20 ÷ 4 × 3 = 15 cm
2 marks

Q233. Simplify the ratio 0.4:1.6.

Show answer
1:4
2 marks

Q234. Find the percentage increase from 40 to 52.

Show answer
Increase = 12. 12/40 = 30%
Grade 6
3 marks

Q235. x and y are in direct proportion. When x=5, y=20. Find y when x=8.

Show answer
k = 4. y = 32
2 marks

Q236. A car travels at constant speed, covering 180km in 2 hours 30 minutes. Find its speed in km/h.

Show answer
180 ÷ 2.5 = 72 km/h
3 marks

Q237. A journey takes 4 hours at 60mph. How long would it take at 80mph?

Show answer
4 × 60 ÷ 80 = 3 hours (inverse proportion)
3 marks

Q238. 5 workers can build a wall in 12 days. How many days would 3 workers take?

Show answer
5 × 12 ÷ 3 = 20 days (inverse proportion)
2 marks

Q239. Convert a speed of 15 m/s to km/h.

Show answer
15 × 3.6 = 54 km/h
2 marks

Q240. Convert a speed of 72 km/h to m/s.

Show answer
72 ÷ 3.6 = 20 m/s
2 marks

Q241. Density = mass ÷ volume. Find the density of an object with mass 60g and volume 15cm³.

Show answer
60 ÷ 15 = 4 g/cm³
2 marks

Q242. Find the mass of an object with density 2.5g/cm³ and volume 40cm³.

Show answer
2.5 × 40 = 100 g
3 marks

Q243. A car depreciates from £15,000 to £12,000 in one year. Find the percentage decrease.

Show answer
Decrease = 3000. 3000/15000 = 20%
3 marks

Q244. Find the compound interest on £2000 at 5% per annum for 2 years.

Show answer
2000 × 1.05² = 2205. Interest = £205
2 marks

Q245. Two similar triangles have a scale factor of 3. If the area of the smaller is 8cm², find the area of the larger.

Show answer
8 × 3² = 72 cm²
2 marks

Q246. Two similar shapes have a length ratio of 2:5. Find the ratio of their areas.

Show answer
4:25
2 marks

Q247. A recipe for 8 people needs 3 eggs. How many eggs (to the nearest whole number) are needed for 20 people?

Show answer
3 ÷ 8 × 20 = 7.5 → 8 eggs
2 marks

Q248. Pressure = Force ÷ Area. Find the pressure exerted by a force of 240N over an area of 4m².

Show answer
240 ÷ 4 = 60 N/m² (Pa)
3 marks

Q249. y is directly proportional to x. When x=6, y=15. Find x when y=25.

Show answer
k = 2.5. x = 10
2 marks

Q250. A photo is enlarged by a scale factor of 1.5. If the original width is 8cm, find the new width.

Show answer
8 × 1.5 = 12 cm
3 marks

Q251. Two similar cylinders have volumes in the ratio 8:125. Find the ratio of their heights.

Show answer
Cube root of 8 : cube root of 125 = 2:5
Grade 7
3 marks

Q252. y is inversely proportional to x. When x=3, y=20. Find y when x=12.

Show answer
k = xy = 60. y = 5
3 marks

Q253. p is inversely proportional to q². When q=2, p=9. Find p when q=3.

Show answer
k = pq² = 36. p = 4
3 marks

Q254. The cost, C, of a journey is directly proportional to the distance, d. If C=£15 when d=50 miles, find C when d=80 miles.

Show answer
k = 0.3. C = £24
3 marks

Q255. Two similar solids have volumes 64cm³ and 216cm³. Find the ratio of their surface areas.

Show answer
Length ratio = cube root(64):cube root(216) = 4:6 = 2:3. Area ratio = 4:9
3 marks

Q256. A map has scale 1:20,000. Two towns are 8.5cm apart on the map. Find the real distance in km.

Show answer
8.5 × 20,000 = 170,000 cm = 1.7 km
4 marks

Q257. Find the compound interest on £3000 at 3.5% per annum for 3 years, to the nearest penny.

Show answer
3000 × 1.035³ = 3326.15... Interest ≈ £326.15
4 marks

Q258. A car depreciates by 18% each year. Find its value after 2 years if it started at £22,000.

Show answer
22000 × 0.82² = £14,792.80
3 marks

Q259. y=kx³. When x=2, y=40. Find y when x=5.

Show answer
k = 5. y = 625
4 marks

Q260. A recipe requires flour, butter, and sugar in the ratio 6:3:2. If 180g of flour is used, find the total mass of all three ingredients.

Show answer
Scale factor = 30. Butter = 90g, sugar = 60g. Total = 330 g
3 marks

Q261. a is inversely proportional to b, and a=8 when b=5. Find b when a=20.

Show answer
k = 40. b = 2
3 marks

Q262. After a 12% decrease, a value is 396. Find the original value.

Show answer
396 ÷ 0.88 = 450
3 marks

Q263. Two similar containers have surface areas in the ratio 9:25. Find the ratio of their volumes.

Show answer
Length ratio = 3:5. Volume ratio = 27:125
3 marks

Q264. A speed camera measures a car covering 40m in 1.6 seconds. Find its speed in km/h.

Show answer
40 ÷ 1.6 = 25 m/s = 25 × 3.6 = 90 km/h
4 marks

Q265. £1200 is invested at 6% compound interest. Find its value after 4 years, to the nearest pound.

Show answer
1200 × 1.064£1515
3 marks

Q266. y varies directly as the square root of x. When x=16, y=8. Find y when x=25.

Show answer
k = 2. y = 10
2 marks

Q267. Two similar shapes have a volume ratio of 27:64. Find the ratio of a pair of corresponding lengths.

Show answer
Cube root of 27 : cube root of 64 = 3:4
Grade 8
3 marks

Q268. p is directly proportional to q³. When q=2, p=40. Find p when q=5.

Show answer
k = 5. p = 625
3 marks

Q269. y is inversely proportional to x². When x=4, y=3. Find y when x=2.

Show answer
k = yx² = 48. y = 12
4 marks

Q270. A quantity decays exponentially, decreasing by 8% each year from an initial value of £5000. Find its value after 5 years, to the nearest pound.

Show answer
5000 × 0.925£3295
4 marks

Q271. Two similar cones have heights in ratio 2:3. The smaller has volume 32cm³. Find the volume of the larger.

Show answer
Volume ratio = 8:27. Larger = 32 × 27/8 = 108 cm³
3 marks

Q272. Find the original amount if, after two successive 10% decreases, the amount is £324.

Show answer
324 ÷ 0.9² = £400
4 marks

Q273. A car's value depreciates by 20% in the first year and 15% in each subsequent year. Find its value after 3 years if it started at £20,000.

Show answer
20000 × 0.8 × 0.85 × 0.85 = £11,560
3 marks

Q274. y=kx², and y=48 when x=4. Find x when y=75.

Show answer
k = 3. 75=3x² ⇒ x²=25 ⇒ x = 5
3 marks

Q275. A sphere and a cone are mathematically similar. Their surface areas are in the ratio 4:9. Find the ratio of their volumes.

Show answer
Length ratio = 2:3. Volume ratio = 8:27
4 marks

Q276. £8000 is invested at compound interest. After 3 years, it has grown to £9261. Find the annual interest rate.

Show answer
9261 ÷ 8000 = 1.157625. Cube root = 1.05. Rate = 5%
3 marks

Q277. A radioactive isotope has a half-life of 3 years. Starting with 400g, find the mass remaining after 12 years.

Show answer
12 ÷ 3 = 4 half-lives. 400 × (1/2)4 = 25 g
3 marks

Q278. Two similar prisms have volumes 27cm³ and 125cm³. Find the ratio of their surface areas.

Show answer
Length ratio = 3:5. Area ratio = 9:25
3 marks

Q279. y is directly proportional to x². Given y=18 when x=3, find x when y=200.

Show answer
k = 2. x²=100 ⇒ x = 10
3 marks

Q280. A car's value V after t years is V=15,000×(0.85)^t. Find the value after 5 years, to the nearest pound.

Show answer
15000 × 0.855£6656
3 marks

Q281. a³ is directly proportional to b, and a=2 when b=40. Find a when b=135.

Show answer
k = 5. a³=27 ⇒ a = 3
2 marks

Q282. A quantity increases by 5% per year. Write an expression, in terms of n, for the value after n years if the initial value is £P.

Show answer
P × 1.05n
3 marks

Q283. Two similar solids made of the same material have masses in the ratio 8:27. Find the ratio of their surface areas.

Show answer
Mass ratio = volume ratio. Length ratio = 2:3. Area ratio = 4:9
Grade 9
4 marks

Q284. p varies inversely as the cube of q. When q=2, p=10. Find q when p=1.25.

Show answer
k = 80. 1.25 = 80/q³ ⇒ q³=64 ⇒ q = 4
3 marks

Q285. Two similar solids have volumes in the ratio 125:512. Find the ratio of their surface areas.

Show answer
Length ratio = cube root(125):cube root(512) = 5:8. Area ratio = 25:64
4 marks

Q286. A population grows exponentially at 4% per year. Find, to the nearest whole number, the population after 10 years if it starts at 12,000.

Show answer
12000 × 1.041017,763
4 marks

Q287. A sum invested at compound interest of r% per annum increases by a factor of 1.3382 (to 4 d.p.) after 5 years. Find r, to 1 decimal place.

Show answer
r = (1.33821/5−1)×100 ≈ 6.0%
4 marks

Q288. A car's value falls from £25,000 to £14,762.50 in 3 years, decreasing by the same percentage each year. Find the annual percentage decrease, to 1 decimal place.

Show answer
Multiplier = (14762.5/25000)1/3 ≈ 0.839. Decrease ≈ 16.1%
3 marks

Q289. y²=kx. Given y=6 when x=3, find y when x=12 (where y>0).

Show answer
k = 12. y²=144 ⇒ y = 12
4 marks

Q290. A radioactive substance decays exponentially with a half-life of 5 years. Find the percentage remaining after 8 years, to 1 decimal place.

Show answer
(1/2)8/5 × 100 ≈ 33.0%
3 marks

Q291. Prove algebraically that if a is directly proportional to b, and b is directly proportional to c, then a is directly proportional to c.

Show answer
a=kb, b=mc, so a=kmc=Kc where K=km is constant. Hence a is directly proportional to c. Shown.
3 marks

Q292. Two similar cylinders have radii in the ratio 3:4. Find the ratio of (a) their curved surface areas (b) their volumes.

Show answer
(a) 9:16 (b) 27:64
3 marks

Q293. Q is inversely proportional to the square root of t. When t=4, Q=10. Find Q when t=25.

Show answer
k = Q√t = 20. Q = 4
3 marks

Q294. The value of an investment increases by x% each year. After 2 years, its value has increased by 21%. Find x.

Show answer
(1+x/100)²=1.21 ⇒ 1+x/100=1.1 ⇒ x = 10
4 marks

Q295. A cone of height 12cm is cut by a plane parallel to its base, 1/3 of the way up from the apex (so the small similar cone has height 4cm). Find the ratio of the volume of the small cone to the volume of the remaining frustum.

Show answer
Small cone volume = (4/12)³ = 1/27 of the full cone. Frustum = 26/27. Ratio = 1:26
4 marks

Q296. p is proportional to q³ and inversely proportional to r. p=20 when q=2 and r=4. Find p when q=3 and r=9.

Show answer
k = pr/q³ = 20×4/8 = 10. p = 10×27/9 = 30
3 marks

Q297. Two similar shapes have areas in the ratio 16:81. A length on the smaller shape is 8cm. Find the corresponding length on the larger shape.

Show answer
Length ratio = 4:9. 8 ÷ 4 × 9 = 18 cm
3 marks

Q298. A bacteria population is modelled as P=P0 × 2^(t/20), where t is in minutes. Find, to the nearest minute, how long it takes for the population to triple.

Show answer
2t/20=3 ⇒ t = 20 × ln3/ln2 ≈ 32 minutes
3 marks

Q299. Find the original value if, after a 12% increase followed by a 12% decrease (applied successively), the result is £4878.72.

Show answer
Multiplier = 1.12 × 0.88 = 0.9856. 4878.72 ÷ 0.9856 = £4950
3 marks

Q300. Prove that if x is inversely proportional to y, and y is inversely proportional to z, then x is directly proportional to z.

Show answer
x=k/y, y=m/z, so x=kz/m=Kz where K=k/m is constant. Hence x is directly proportional to z. Shown.
Grade 4
2 marks

Q301. Find the missing side of a right-angled triangle with legs 6cm and 8cm.

Diagram for Q301
Show answer
√(6²+8²) = √100 = 10 cm
2 marks

Q302. Find the area of a triangle with base 10cm and height 6cm.

Diagram for Q302
Show answer
½ × 10 × 6 = 30 cm²
1 mark

Q303. Find the sum of the interior angles of a quadrilateral.

Show answer
360°
2 marks

Q304. Find the circumference of a circle with radius 7cm, using π=3.14, to 1 decimal place.

Show answer
2 × 3.14 × 7 = 44.0 cm
2 marks

Q305. Find the area of a circle with radius 5cm, using π=3.14, to 1 decimal place.

Show answer
3.14 × 25 = 78.5 cm²
1 mark

Q306. Find the area of a rectangle 8cm by 5cm.

Show answer
40 cm²
1 mark

Q307. Find the perimeter of a rectangle 8cm by 5cm.

Show answer
26 cm
2 marks

Q308. Two angles on a straight line are 3x and 2x. Find x.

Diagram for Q308
Show answer
5x=180 ⇒ x = 36
1 mark

Q309. Find the volume of a cuboid 4cm × 3cm × 2cm.

Show answer
24 cm³
1 mark

Q310. A triangle has angles 50° and 65°. Find the third angle.

Show answer
65°
1 mark

Q311. Reflect the point (3,2) in the x-axis.

Show answer
(3, −2)
1 mark

Q312. Translate the point (1,4) by the vector (3,−2).

Show answer
(4, 2)
2 marks

Q313. Find the area of a parallelogram with base 9cm and height 4cm.

Diagram for Q313
Show answer
36 cm²
2 marks

Q314. Rotate the point (2,0) by 90° clockwise about the origin.

Show answer
(0, −2)
2 marks

Q315. Find the size of one interior angle of a regular hexagon.

Show answer
Sum = 720°. 720 ÷ 6 = 120°
2 marks

Q316. Find the surface area of a cube with side length 4cm.

Show answer
6 × 4² = 96 cm²
1 mark

Q317. Enlarge the point (2,3) by scale factor 2, centre the origin.

Show answer
(4, 6)
Grade 5
2 marks

Q318. Find the hypotenuse of a right-angled triangle with legs 5cm and 12cm.

Diagram for Q318
Show answer
√(25+144) = 13 cm
2 marks

Q319. A right-angled triangle has hypotenuse 13cm and one leg 5cm. Find the other leg.

Diagram for Q319
Show answer
√(169−25) = 12 cm
3 marks

Q320. In a right-angled triangle, one angle is 40° and the hypotenuse is 12cm. Find the side opposite this angle, to 1 decimal place.

Diagram for Q320
Show answer
12 × sin40° ≈ 7.7 cm
3 marks

Q321. In a right-angled triangle, one angle is 35° and the adjacent side is 8cm. Find the hypotenuse, to 1 decimal place.

Diagram for Q321
Show answer
8 ÷ cos35° ≈ 9.8 cm
1 mark

Q322. Find the volume of a cuboid 5cm × 4cm × 3cm.

Show answer
60 cm³
2 marks

Q323. Find the surface area of a cuboid 5cm × 4cm × 3cm.

Show answer
2(20+15+12) = 94 cm²
2 marks

Q324. Find the area of a trapezium with parallel sides 6cm and 10cm and height 4cm.

Diagram for Q324
Show answer
½(6+10) × 4 = 32 cm²
3 marks

Q325. Find the volume of a cylinder with radius 3cm and height 10cm, to 1 decimal place.

Show answer
π × 9 × 10 ≈ 282.7 cm³
1 mark

Q326. A triangle has angles 65° and 48°. Find the third angle.

Show answer
67°
2 marks

Q327. Find the area of a circle with diameter 10cm, to 1 decimal place.

Show answer
Radius 5. π × 25 ≈ 78.5 cm²
2 marks

Q328. Find the length of an arc: radius 6cm, angle 120°, to 1 decimal place.

Diagram for Q328
Show answer
120/360 × 2π × 6 ≈ 12.6 cm
2 marks

Q329. Find the area of a sector: radius 8cm, angle 90°, to 1 decimal place.

Diagram for Q329
Show answer
90/360 × π × 64 ≈ 50.3 cm²
1 mark

Q330. Reflect the point (−2,5) in the y-axis.

Show answer
(2, 5)
2 marks

Q331. Find the volume of a triangular prism with cross-sectional area 15cm² and length 8cm.

Show answer
15 × 8 = 120 cm³
2 marks

Q332. Describe fully the single transformation that maps triangle A to triangle B, given B is the image of A reflected in the line y=x.

Show answer
Reflection in the line y = x
1 mark

Q333. Point A is due north of point B. Find the bearing of B from A.

Show answer
180°
2 marks

Q334. Two angles in a triangle are equal and the third is 40°. Find the two equal angles.

Show answer
(180−40) ÷ 2 = 70° each
Grade 6
2 marks

Q335. Points A, B, C lie on a circle. Angle AOC at the centre O is 100°. Find angle ABC at the circumference.

Diagram for Q335
Show answer
50° (half the angle at the centre)
4 marks

Q336. In triangle ABC, angle A=50°, angle C=70°, side c=10cm (opposite C). Find side a (opposite A), to 1 decimal place.

Diagram for Q336
Show answer
a = 10sin50°/sin70° ≈ 8.2 cm
4 marks

Q337. In triangle ABC, a=7cm, b=9cm, angle C=60°. Find side c using the cosine rule, to 1 decimal place.

Diagram for Q337
Show answer
c = √(49+81−2(7)(9)cos60°) = √67 ≈ 8.2 cm
2 marks

Q338. Two similar shapes have a scale factor of 4. The smaller has area 10cm². Find the area of the larger.

Show answer
10 × 4² = 160 cm²
2 marks

Q339. Find the arc length: radius 6cm, angle 120°, giving your answer in terms of π.

Diagram for Q339
Show answer
120/360 × 2π × 6 = 4π cm
2 marks

Q340. Find the sector area: radius 8cm, angle 90°, giving your answer in terms of π.

Diagram for Q340
Show answer
90/360 × π × 64 = 16π cm²
2 marks

Q341. Find the length of the diagonal of a rectangle 6cm by 8cm.

Diagram for Q341
Show answer
√(36+64) = 10 cm
3 marks

Q342. A cone has radius 5cm and slant height 13cm. Find its perpendicular height.

Diagram for Q342
Show answer
√(169−25) = 12 cm
2 marks

Q343. Find the volume of a pyramid with base area 24cm² and height 9cm.

Show answer
1/3 × 24 × 9 = 72 cm³
2 marks

Q344. Two similar solids have a length ratio of 3:7. Find the ratio of their volumes.

Show answer
27:343
3 marks

Q345. In a right-angled triangle, the opposite side is 5cm and the hypotenuse is 13cm. Find the angle, to 1 decimal place.

Diagram for Q345
Show answer
sin−1(5/13) ≈ 22.6°
1 mark

Q346. State the equation of a circle with centre (0,0) and radius 5.

Show answer
x² + y² = 25
2 marks

Q347. Find the midpoint of (2,3) and (8,11).

Show answer
(5, 7)
2 marks

Q348. Find the distance between (1,2) and (4,6).

Show answer
√(9+16) = 5
2 marks

Q349. Describe the locus of points equidistant from two fixed points A and B.

Diagram for Q349
Show answer
The perpendicular bisector of AB
1 mark

Q350. Find the interior angle sum of a regular nonagon (9 sides).

Show answer
(9−2) × 180 = 1260°
2 marks

Q351. A triangle is inscribed in a semicircle (diameter as one side). One of the other angles is 35°. Find the third angle.

Diagram for Q351
Show answer
Angle in semicircle = 90°. Third angle = 180−90−35 = 55°
Grade 7
3 marks

Q352. Use the cosine rule to show that a triangle with sides 6, 8, 10 is right-angled (find the angle opposite the side of length 10).

Diagram for Q352
Show answer
cos−1((36+64−100)/(2×6×8)) = cos−1(0) = 90°
3 marks

Q353. An arc has length 15.7cm on a circle of radius 10cm. Find the angle subtended at the centre, to the nearest degree.

Show answer
Angle (radians) = 15.7/10 = 1.57. In degrees ≈ 90°
3 marks

Q354. A cuboid has dimensions 3cm × 4cm × 12cm. Find the length of the space diagonal.

Diagram for Q354
Show answer
√(9+16+144) = √169 = 13 cm
2 marks

Q355. Find the volume of a cone with radius 6cm and height 10cm, to 1 decimal place.

Show answer
1/3 × π × 36 × 10 ≈ 377.0 cm³
2 marks

Q356. Find the volume of a sphere with radius 9cm, to the nearest whole number.

Show answer
4/3 × π × 729 ≈ 3054 cm³
2 marks

Q357. Find the surface area of a sphere with radius 7cm, to the nearest whole number.

Show answer
4 × π × 49 ≈ 616 cm²
2 marks

Q358. A ship sails on a bearing of 065°, then turns onto a bearing of 155°. Find the angle turned through.

Show answer
155−65 = 90°
3 marks

Q359. An isosceles triangle has equal sides 10cm and base 12cm. Find its perpendicular height.

Diagram for Q359
Show answer
Half base = 6. √(100−36) = 8 cm
2 marks

Q360. Two similar cones have surface areas in the ratio 9:16. Find the ratio of their heights.

Show answer
3:4
2 marks

Q361. The angle at the centre of a circle for a given arc is 76°. Find the angle at the circumference subtended by the same arc.

Show answer
38°
3 marks

Q362. A cyclic quadrilateral has opposite angles 4x and 2x+30. Find x.

Diagram for Q362
Show answer
4x+2x+30=180 ⇒ x = 25
3 marks

Q363. A circle has radius 10cm. A chord subtends an angle of 60° at the centre. Find the length of the chord.

Diagram for Q363
Show answer
Isosceles triangle with two 10cm sides and included angle 60° is equilateral: chord = 10 cm
3 marks

Q364. A cone has curved surface area 220cm² and slant height 14cm (A=πrl). Find the radius, to 1 decimal place.

Show answer
r = 220 ÷ (π × 14) ≈ 5.0 cm
4 marks

Q365. A frustum is formed by removing a cone of radius 3cm and height 6cm from a similar cone of radius 6cm and height 12cm. Find the volume of the frustum, to 1 decimal place.

Show answer
Full cone ≈ 452.4, small cone ≈ 56.5. Frustum ≈ 395.8 cm³
2 marks

Q366. A(1,1), B(5,1), C(5,4) form a right triangle. Find the length of the hypotenuse AC.

Show answer
√(16+9) = 5
2 marks

Q367. A regular polygon has an exterior angle of 24°. Find the number of sides.

Show answer
360 ÷ 24 = 15 sides
Grade 8
3 marks

Q368. In triangle ABC, a=10, angle A=50°, b=8. Use the sine rule to find angle B, to 1 decimal place.

Diagram for Q368
Show answer
sinB = 8sin50°/10. B ≈ 37.8°
4 marks

Q369. In triangle ABC, a=5, b=7, c=10. Use the cosine rule to find angle C (opposite c), to 1 decimal place.

Diagram for Q369
Show answer
cosC = (25+49−100)/70. C ≈ 111.8°
4 marks

Q370. Find the area of a segment of a circle: radius 8cm, angle 80°, to 1 decimal place.

Diagram for Q370
Show answer
Sector ≈ 44.68, triangle ≈ 31.51. Segment ≈ 13.2 cm²
3 marks

Q371. Two similar pyramids have volumes 64cm³ and 729cm³. Find the ratio of their surface areas.

Show answer
Length ratio = cube root(64):cube root(729) = 4:9. Area ratio = 16:81
3 marks

Q372. A cone has base radius 5cm and vertical height 12cm. Find its curved surface area in terms of π.

Show answer
Slant height = 13 cm. CSA = π(5)(13) = 65π cm²
2 marks

Q373. PT is a tangent to a circle at T with centre O. OT=6cm and PT=8cm. Find OP.

Diagram for Q373
Show answer
√(36+64) = 10 cm (angle OTP = 90°)
3 marks

Q374. A triangle is inscribed in a semicircle with diameter 26cm and one other side 10cm. Find the third side.

Diagram for Q374
Show answer
Angle in semicircle = 90°. √(676−100) = 24 cm
3 marks

Q375. Chords AB and CD intersect at P inside a circle. AP=4, PB=9, CP=6. Find PD.

Diagram for Q375
Show answer
AP×PB = CP×PD ⇒ PD = 36/6 = 6
3 marks

Q376. A vertical pole of height 5m casts a shadow of 3m. Find the angle of elevation of the sun, to 1 decimal place.

Diagram for Q376
Show answer
tan−1(5/3) ≈ 59.0°
4 marks

Q377. Find the volume of a frustum formed by removing a cone of radius 3cm and height 4cm from a similar cone of radius 9cm and height 12cm, to 1 decimal place.

Show answer
Full cone ≈ 1017.9, small cone ≈ 37.7. Frustum ≈ 980.2 cm³
2 marks

Q378. A cyclic quadrilateral ABCD has angle A=3x−10 and angle C=x+50. Find x.

Show answer
(3x−10)+(x+50)=180 ⇒ x = 35
3 marks

Q379. In triangle ABC, angle A=112°, angle B=35°, side a=20cm. Find side b, to 1 decimal place.

Show answer
b = 20sin35°/sin112° ≈ 12.4 cm
2 marks

Q380. Find the total surface area of a hemisphere with radius 6cm, in terms of π.

Show answer
Curved = 2π(36) = 72π; flat = π(36) = 36π. Total = 108π cm²
3 marks

Q381. Two tangents from external point P touch a circle (centre O) at A and B. Angle APB=50°. Find angle AOB.

Diagram for Q381
Show answer
PAOB has right angles at A, B. Angle AOB = 360−90−90−50 = 130°
2 marks

Q382. Find the length of AB, given A(−3,2) and B(5,−4).

Show answer
√(64+36) = 10
4 marks

Q383. A right pyramid has a square base of side 10cm and height 12cm. Find the length of a sloping edge, to 1 decimal place.

Diagram for Q383
Show answer
Half-diagonal = √50. Edge = √(144+50) ≈ 13.9 cm
Grade 9
2 marks

Q384. A tangent-chord angle is 65°. Using the alternate segment theorem, find the angle in the alternate segment.

Diagram for Q384
Show answer
65°, by the alternate segment theorem
4 marks

Q385. A cuboid has dimensions 5cm, 4cm and 3cm. Find the angle the space diagonal makes with the base, to 1 decimal place.

Diagram for Q385
Show answer
Base diagonal = √41 ≈ 6.40. Angle = tan−1(3/6.40) ≈ 25.1°
3 marks

Q386. Find the area of triangle ABC given a=7, b=9, angle C=60°, using Area = 1/2 ab sinC, in exact surd form.

Show answer
½(7)(9)sin60° = 31.5 × √3/2 = 15.75√3 cm²
2 marks

Q387. State the condition used to prove two triangles congruent when you know two sides and the included angle are equal in each.

Show answer
SAS (side-angle-side)
3 marks

Q388. A triangle has sides 9cm, 12cm, 15cm. Show that it is right-angled, then find its area.

Diagram for Q388
Show answer
9²+12²=81+144=225=15², so right-angled. Area = ½(9)(12) = 54 cm²
3 marks

Q389. Find the volume of a frustum of a cone: r1=4cm, r2=10cm, height 9cm, using V=1/3 πh(r1²+r1r2+r2²), in terms of π.

Show answer
1/3 × π × 9 × (16+40+100) = 3π(156) = 468π cm³
3 marks

Q390. A regular hexagon has side length 8cm. Find its area, using the fact that it is made of 6 equilateral triangles, in exact surd form.

Diagram for Q390
Show answer
One triangle: √3/4 × 64 = 16√3. Total = 6 × 16√3 = 96√3 cm²
3 marks

Q391. Given vectors a=(3,1) and b=(−1,4), find |a+b|, to 2 decimal places.

Show answer
a+b = (2,5). √(4+25) ≈ 5.39
2 marks

Q392. State the reasoning (congruence condition) used to prove that the perpendicular from the centre of a circle to a chord bisects the chord.

Show answer
RHS (Right angle, Hypotenuse (radius), Shared side)
3 marks

Q393. A triangle has sides in the ratio 3:4:5 and perimeter 36cm. Find its area.

Show answer
Sides: 9, 12, 15 cm (right-angled, as 3:4:5). Area = ½(9)(12) = 54 cm²
3 marks

Q394. Find the exact value of sin60°cos30° − sin30°cos60°, using exact surd values.

Show answer
(√3/2)(√3/2) − (1/2)(1/2) = 3/4 − 1/4 = 1/2 (matches sin30°)
3 marks

Q395. Two similar cones have slant heights 6cm and 15cm. The smaller has curved surface area 30π cm². Find the curved surface area of the larger.

Show answer
Area ratio = (15/6)² = 6.25. Larger = 30π × 6.25 = 187.5π cm²
2 marks

Q396. Find angle θ such that cosθ=−0.5, for 0°≤θ≤360°.

Show answer
θ = 120° or θ = 240°
4 marks

Q397. In triangle ABC, angle A=30°, a=5, b=8. Use the sine rule to find the two possible values of angle B, to 1 decimal place.

Show answer
sinB = 8sin30°/5 = 0.8. B ≈ 53.1° or B ≈ 126.9° (both valid, ambiguous case)
3 marks

Q398. A sector of a circle has radius 12cm and area 48π cm². Find the angle of the sector.

Diagram for Q398
Show answer
θ/360 × 144π = 48π ⇒ θ/360 = 1/3 ⇒ θ = 120°
2 marks

Q399. Find the equation of a circle with centre (2,−3) and radius 5.

Show answer
(x−2)² + (y+3)² = 25
3 marks

Q400. A circle has radius 5cm and centre O. An external point P is 13cm from O. Find the length of the tangent from P to the circle.

Show answer
Tangent is perpendicular to the radius at the point of contact. √(13²−5²) = √144 = 12 cm
Grade 4
1 mark

Q401. Find the mean of: 3, 5, 7, 9, 6.

Show answer
6
1 mark

Q402. Find the median of: 12, 7, 15, 9, 11.

Show answer
Sorted: 7, 9, 11, 12, 15. Median = 11
1 mark

Q403. Find the mode of: 4, 7, 4, 9, 4, 2.

Show answer
4
1 mark

Q404. Find the range of: 15, 8, 22, 3, 17.

Show answer
22−3 = 19
1 mark

Q405. A bag has 4 red, 3 blue, 3 green counters. Find P(red).

Show answer
4/10 = 2/5
1 mark

Q406. A fair die is rolled. Find P(even number).

Show answer
3/6 = 1/2
1 mark

Q407. A spinner has sections numbered 1-8. Find P(number greater than 5).

Show answer
3/8
2 marks

Q408. Two fair coins are flipped. List all outcomes and find P(two heads).

Show answer
HH, HT, TH, TT. P = 1/4
1 mark

Q409. Find the mean of: 10, 12, 14, 16, 18.

Show answer
14
2 marks

Q410. In a survey, 15 people preferred tea and 25 preferred coffee. Find the probability a randomly chosen person prefers coffee.

Show answer
25/40 = 5/8
2 marks

Q411. Find the median of: 3, 8, 5, 9, 2, 7.

Show answer
Sorted: 2, 3, 5, 7, 8, 9. Median = (5+7)/2 = 6
1 mark

Q412. A bag has 10 balls, 6 of which are red. Find P(not red).

Show answer
4/10 = 2/5
1 mark

Q413. Find the range of: 45, 60, 38, 72, 50.

Show answer
72−38 = 34
1 mark

Q414. A card is drawn from a standard deck of 52. Find P(heart).

Show answer
13/52 = 1/4
1 mark

Q415. Find the mean of: 2, 2, 2, 2, 2.

Show answer
2
2 marks

Q416. A fair 6-sided die is rolled twice. Find P(both rolls give a 6).

Show answer
1/36
1 mark

Q417. Find the mode of: 3,3,3,7,7,9,9,9,9.

Show answer
9
Grade 5
3 marks

Q418. Find the mean from the frequency table: value 1, 2, 3, 4 with frequencies 2, 5, 4, 1.

Show answer
Total = 28, n = 12. Mean = 28/12 = 7/3 ≈ 2.33
3 marks

Q419. In a class of 32 students, 25 study French. Find the number of students who do NOT study French.

Show answer
32−25 = 7 students
2 marks

Q420. A bag has 5 red, 4 blue, 3 green balls. One is drawn. Find P(blue or green).

Show answer
7/12
2 marks

Q421. Two fair dice are rolled. Find P(sum=7).

Show answer
6/36 = 1/6
3 marks

Q422. Find the interquartile range of: 2, 4, 5, 7, 9, 12, 15, 18.

Show answer
LQ = 4.5, UQ = 13.5. IQR = 9
2 marks

Q423. A spinner has 4 equal sections: red, blue, green, yellow. It is spun twice. Find P(same colour both times).

Show answer
4 × (1/4 × 1/4) = 1/4
3 marks

Q424. Find the mean from the frequency table: score 0, 1, 2 with frequencies 5, 8, 7.

Show answer
Total = 22, n = 20. Mean = 1.1
3 marks

Q425. A survey of 50 people found 30 like chocolate, 25 like vanilla, and 15 like both. Find how many like neither.

Show answer
Union = 30+25−15 = 40. Neither = 10
3 marks

Q426. A bag has 6 red and 4 blue counters. One is removed and not replaced, then a second is drawn. Find P(both blue).

Diagram for Q426
Show answer
4/10 × 3/9 = 2/15
3 marks

Q427. Find the estimated mean of grouped data: class 0-10 (freq 3), 10-20 (freq 5), 20-30 (freq 2).

Show answer
Midpoints 5, 15, 25. Sum = 15+75+50 = 140, n=10. Mean = 14
1 mark

Q428. Find P(not rolling a 3) on a fair die.

Show answer
5/6
3 marks

Q429. A box has 3 red and 5 blue pens. Two are picked without replacement. Find P(first red, second blue).

Show answer
3/8 × 5/7 = 15/56
2 marks

Q430. Find the interquartile range of: 1, 3, 5, 7, 9, 11, 13.

Show answer
Median = 7. LQ (lower half) = 3, UQ (upper half) = 11. IQR = 8
2 marks

Q431. 60% of people are right-handed and the rest are left-handed. In a sample of 40 people, how many are left-handed?

Show answer
40% × 40 = 16
2 marks

Q432. A fair coin is flipped 3 times. Find P(exactly 2 heads).

Show answer
HHT, HTH, THH. P = 3/8
1 mark

Q433. The total of 8 numbers is 96. Find their mean.

Show answer
96 ÷ 8 = 12
2 marks

Q434. Two mutually exclusive events A and B have P(A)=0.3 and P(B)=0.25. Find P(A or B).

Show answer
0.55
Grade 6
3 marks

Q435. A bag has 3 red and 2 blue counters. Two are drawn without replacement. Find P(both the same colour).

Diagram for Q435
Show answer
(3/5 × 2/4) + (2/5 × 1/4) = 2/5
3 marks

Q436. A spinner has P(win)=0.3. It is spun twice. Find P(win exactly once).

Show answer
2 × 0.3 × 0.7 = 0.42
3 marks

Q437. In a class of 30, 18 study French, 15 study Spanish, and 6 study both. Find P(studies neither).

Show answer
Union = 27. Neither = 3. P = 1/10
3 marks

Q438. Estimate the median from a grouped frequency table: 0-10 (freq 4), 10-20 (freq 10), 20-30 (freq 6), total 20.

Show answer
Median position 10th/11th value, in the 10-20 class. Estimate ≈ 10 + 6/10 × 10 = 16
3 marks

Q439. Estimate the mean of the grouped data: 0-10 (mid 5, freq 4), 10-20 (mid 15, freq 10), 20-30 (mid 25, freq 6).

Show answer
Sum = 20+150+150 = 320, n=20. Mean = 16
3 marks

Q440. A Venn diagram shows |A|=12, |B|=9, |A∩B|=4, in a universal set of 30. Find P(A only).

Diagram for Q440
Show answer
A only = 12−4 = 8. P = 8/30 = 4/15
3 marks

Q441. Two fair dice are rolled. Find P(sum is a multiple of 3).

Show answer
Sums 3, 6, 9, 12: ways = 2+5+4+1 = 12. P = 12/36 = 1/3
3 marks

Q442. A bag has 4 red and x blue counters. If P(red)=2/5, find x.

Show answer
4/(4+x) = 2/5 ⇒ x = 6
2 marks

Q443. A cumulative frequency table gives: ≤10: 5, ≤20: 18, ≤30: 35, ≤40: 42, ≤50: 45. Find how many values lie between 20 and 30.

Diagram for Q443
Show answer
35−18 = 17
3 marks

Q444. A biased coin has P(heads)=0.6. It is flipped twice. Find P(at least one head).

Show answer
1−0.4² = 1−0.16 = 0.84
1 mark

Q445. A box plot has min=4, LQ=10, median=15, UQ=22, max=30. Find the interquartile range.

Diagram for Q445
Show answer
22−10 = 12
3 marks

Q446. A card is drawn from a standard deck. Find P(king or heart).

Show answer
4/52 + 13/52 − 1/52 = 16/52 = 4/13
2 marks

Q447. In a group of 25 students, P(left-handed)=0.2. Find how many students are left-handed.

Show answer
0.2 × 25 = 5
2 marks

Q448. Two spinners: Spinner A has P(red)=0.5; Spinner B has P(red)=0.4. Both are spun. Find P(both red).

Show answer
0.2
2 marks

Q449. Using the spinners from the previous question, find P(neither red).

Show answer
0.5 × 0.6 = 0.3
1 mark

Q450. A sample of 40 items has mean 25. Find the total sum of all items.

Show answer
40 × 25 = 1000
2 marks

Q451. P(A)=0.4, and A, B are independent with P(A and B)=0.12. Find P(B).

Show answer
0.12 ÷ 0.4 = 0.3
Grade 7
3 marks

Q452. P(A)=0.5, P(B)=0.3, P(A and B)=0.15. Show that A and B are independent.

Show answer
P(A) × P(B) = 0.5 × 0.3 = 0.15 = P(A∩B), so A and B are independent.
4 marks

Q453. A bag has 5 red and 7 blue balls. Two are drawn without replacement. Find P(different colours).

Diagram for Q453
Show answer
(5/12 × 7/11) + (7/12 × 5/11) = 35/66
1 mark

Q454. A cumulative frequency graph gives LQ=18 and UQ=41. Find the interquartile range.

Show answer
41−18 = 23
4 marks

Q455. A survey of 200 people: 120 own a car, 90 own a bike, 50 own both. Find P(owns exactly one of the two).

Show answer
Car only = 70, bike only = 40. Total = 110. P = 110/200 = 11/20
3 marks

Q456. Estimate the mean of grouped data: 10-20 (mid 15, freq 8), 20-30 (mid 25, freq 12), 30-40 (mid 35, freq 10), to 2 decimal places.

Show answer
Sum = 120+300+350 = 770, n=30. Mean ≈ 25.67
2 marks

Q457. A biased die has P(6)=0.3, and the other five outcomes are equally likely. Find P(1).

Show answer
(1−0.3) ÷ 5 = 0.14
3 marks

Q458. Two independent events: P(A)=0.6, P(B)=0.5. Find P(exactly one of A, B occurs).

Show answer
0.6(0.5) + 0.4(0.5) = 0.5
3 marks

Q459. Find P(drawing 2 aces in a row) from a standard deck, without replacement.

Show answer
4/52 × 3/51 = 1/221
3 marks

Q460. A histogram has bars: 0-5 (height 4), 5-15 (height 2), 15-20 (height 6). Find the total frequency.

Diagram for Q460
Show answer
4(5)+2(10)+6(5) = 20+20+30 = 70
3 marks

Q461. 10 values have mean 20. An 11th value of 35 is added. Find the new mean, to 2 decimal places.

Show answer
(200+35) ÷ 11 ≈ 21.36
3 marks

Q462. A fair die is rolled 3 times. Find P(at least one 6).

Show answer
1−(5/6)³ = 91/216
3 marks

Q463. |ξ|=50, |A|=22, |B|=28, |A∩B|=10. Find P(A' ∩ B').

Diagram for Q463
Show answer
Union = 40. Neither = 10. P = 10/50 = 1/5
3 marks

Q464. Two dice are rolled. Find P(the product of the scores is even).

Show answer
1−P(both odd) = 1−1/4 = 3/4
4 marks

Q465. A bag of 20 balls has 8 red. Two are drawn without replacement. Find P(exactly one red).

Show answer
(8/20 × 12/19) + (12/20 × 8/19) = 48/95
1 mark

Q466. Events A and B are mutually exclusive with P(A)=0.35. Find P(A').

Show answer
0.65
3 marks

Q467. A spinner has P(green)=0.25 each spin. Find P(green at least once in 2 spins).

Show answer
1−0.75² = 0.4375
Grade 8
3 marks

Q468. P(A)=0.4, P(B)=0.5, P(A∪B)=0.7. Find P(A∩B).

Show answer
0.4+0.5−0.7 = 0.2
3 marks

Q469. A bag has 6 red and 4 blue balls. Three are drawn without replacement. Find P(all three red).

Show answer
6/10 × 5/9 × 4/8 = 1/6
2 marks

Q470. A grouped frequency table has cumulative frequencies: 0-10: 8, 10-20: 22, 20-30: 35 (total). State which class contains the median.

Diagram for Q470
Show answer
n=35, median position 17.5, which falls in the 10-20 class
2 marks

Q471. A histogram class 20-50 has frequency density 0.8. Find its frequency.

Show answer
Width = 30. Frequency = 0.8 × 30 = 24
2 marks

Q472. A box plot has Q1=15, Q3=35. An outlier is beyond 1.5×IQR from Q3. Find the upper outlier boundary.

Diagram for Q472
Show answer
IQR = 20. Boundary = 35+1.5(20) = 65
4 marks

Q473. Two independent events A, B: P(A)=x, P(B)=x+0.2, and P(A and B)=0.15. Find x.

Show answer
x(x+0.2)=0.15 ⇒ x²+0.2x−0.15=0 ⇒ x = 0.3 (rejecting the negative root)
3 marks

Q474. P(likes tea)=0.6, P(likes coffee)=0.5, P(likes both)=0.3. Find P(likes neither).

Show answer
Union = 0.8. Neither = 0.2
3 marks

Q475. Two fair dice are rolled. Find P(the difference between the scores is 2).

Show answer
8 favourable pairs out of 36. P = 8/36 = 2/9
3 marks

Q476. A bag has n red balls and 8 blue balls. If P(red)=3/7, find n.

Show answer
n/(n+8) = 3/7 ⇒ n = 6
3 marks

Q477. A test has mean 65 with 30 students. 5 more students with mean 80 are added. Find the new overall mean, to 1 decimal place.

Show answer
(1950+400) ÷ 35 ≈ 67.1
2 marks

Q478. P(A∩B)=0.12 and P(B)=0.3. Find P(A|B).

Show answer
0.12 ÷ 0.3 = 0.4
2 marks

Q479. P(A)=0.5 and P(A|B)=0.5. State, with a reason, whether A and B are independent.

Show answer
Since P(A|B) = P(A), A and B are independent.
4 marks

Q480. A bag of 15 balls has 9 red. Three are drawn without replacement. Find P(first two red, third blue).

Diagram for Q480
Show answer
9/15 × 8/14 × 6/13 = 72/455
1 mark

Q481. A cumulative frequency curve shows 60 out of 80 values are below 45. Find how many values are above 45.

Show answer
80−60 = 20
2 marks

Q482. P(A)=0.45, P(B)=0.35, A and B are mutually exclusive. Find P((A∪B)').

Show answer
P(A∪B) = 0.8. Complement = 0.2
2 marks

Q483. Two independent trials each have P(success)=0.7. Find P(exactly 1 success in 2 trials).

Show answer
2 × 0.7 × 0.3 = 0.42
Grade 9
4 marks

Q484. A bag has 5 red, 3 blue, 2 green balls. Two are drawn without replacement. Find P(different colours).

Diagram for Q484
Show answer
Total ways = C(10,2) = 45. Same-colour ways = C(5,2)+C(3,2)+C(2,2) = 10+3+1 = 14. Different = 31/45
3 marks

Q485. P(A)=0.3, P(B)=0.4, A and B are independent. Find P(A∪B).

Show answer
0.3+0.4−0.12 = 0.58
2 marks

Q486. Data set A has median 40, IQR 10; data set B has median 45, IQR 18. State, with a reason, which is more consistent.

Diagram for Q486
Show answer
Set A is more consistent, as it has a smaller interquartile range.
3 marks

Q487. P(A)=0.6, P(B'|A)=0.25. Find P(A∩B).

Show answer
P(B|A) = 0.75. P(A∩B) = 0.6 × 0.75 = 0.45
4 marks

Q488. A bag of 12 balls has 5 red. Three are drawn without replacement. Find P(exactly 2 red).

Show answer
C(5,2)×C(7,1) / C(12,3) = 10×7/220 = 7/22
2 marks

Q489. A fair coin is flipped 3 times. Find P(at least 2 heads).

Show answer
HHH, HHT, HTH, THH. P = 4/8 = 1/2
3 marks

Q490. Two independent events: P(A)=0.5, P(A∪B)=0.75. Find P(B).

Show answer
0.75 = 0.5+P(B)−0.5P(B) ⇒ P(B) = 0.5
3 marks

Q491. The probability a component is faulty is 0.02. In a batch of 3 (independent), find P(none are faulty), to 4 decimal places.

Show answer
0.98³ ≈ 0.9412
3 marks

Q492. Prove that for two independent events, P(A|B)=P(A).

Show answer
By definition, P(A|B) = P(A∩B)/P(B). Independence gives P(A∩B)=P(A)P(B), so P(A|B) = P(A)P(B)/P(B) = P(A). Shown.
2 marks

Q493. P(reads fiction)=0.7, P(reads non-fiction)=0.5, P(reads both)=0.4. Find P(fiction only).

Show answer
0.7−0.4 = 0.3
3 marks

Q494. Two dice are rolled. Find P(sum is prime).

Show answer
Prime sums: 2, 3, 5, 7, 11. Ways = 1+2+4+6+2 = 15. P = 15/36 = 5/12
3 marks

Q495. A bag has 4 red and 6 blue balls. Balls are drawn one at a time, without replacement, until a red is drawn. Find P(first red on the 2nd draw).

Show answer
6/10 × 4/9 = 4/15
3 marks

Q496. A and B are independent, P(A)=0.25, P(A∪B)=0.4. Find P(B).

Show answer
0.4 = 0.25+P(B)−0.25P(B) ⇒ P(B) = 0.2
4 marks

Q497. A quality test has P(pass)=0.9 for each independent unit. Find P(exactly 3 pass out of 4).

Show answer
C(4,3)(0.9)³(0.1) = 4 × 0.729 × 0.1 = 0.2916
2 marks

Q498. P(A)=0.6, P(B)=0.7, A and B are independent. Find P(neither occurs).

Show answer
0.4 × 0.3 = 0.12
3 marks

Q499. Explain, using a Venn diagram argument, why P(A∪B)=P(A)+P(B)-P(A∩B).

Show answer
Adding P(A) and P(B) counts the overlap region P(A∩B) twice, so it must be subtracted once to give the correct total. Shown.
2 marks

Q500. A biased coin has P(heads)=p. It is flipped twice, and P(two heads)=0.36. Find p.

Show answer
p² = 0.36 ⇒ p = 0.6

These are original questions written in the style of recent papers, not reproductions of any real exam paper. Individual grade labels are indicative, based on typical question-targeting and examiner reports — not an official Pearson document.

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