Lesson T3.3.1

T3.3.1 Percentage increase, decrease and original value Quiz: KS3 Maths, Unit 3

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T3.3.1, Percentage increase, decrease and original value: 20 multiple choice questions for the KS3 Maths (National Curriculum), Unit 3: Ratio, proportion and rates of change, written with Revision Ninja.

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The 20 questions

  1. What is 20% of £150?

    • £30
    • £300
    • £15
    • £20

  2. What is 80 increased by 25%?

    • 100
    • 105
    • 60
    • 20

  3. What is 240 decreased by 15%?

    • 276
    • 225
    • 36
    • 204

  4. After a 20% increase, a price is £36. What was the original price?

    • £30
    • £35
    • £28.80
    • £43.20

  5. A value goes from 40 to 50. What is the percentage increase?

    • 25%
    • 20%
    • 10%
    • 80%

  6. A value falls from 120 to 90. What is the percentage decrease?

    • 25%
    • 75%
    • 33%
    • 30%

  7. After a 15% decrease, a value is 68. What was the original value?

    • 57.80
    • 78.20
    • 80
    • 90

  8. What is the multiplier for a 35% increase?

    • 1.65
    • 1.35
    • 1.035
    • 0.35

  9. What is the multiplier for a 12% decrease?

    • 1.12
    • 0.112
    • 0.12
    • 0.88

  10. A jacket costs £60 in a sale with 30% off. What is the sale price?

    • £30
    • £18
    • £42
    • £48

  11. A town has 2000 people and its population grows by 5% in one year. What is the new population?

    • 2100
    • 2005
    • 2500
    • 2050

  12. A price of £200 is increased by 10% and then decreased by 10%. What is the final price?

    • £220
    • £200
    • £180
    • £198

  13. A score rises from 45 to 54. What is the percentage increase?

    • 20%
    • 25%
    • 15%
    • 9%

  14. A bike is priced at £150 after a 20% increase. What was its price before the increase?

    • £120
    • £125
    • £180
    • £130

  15. A price falls from £80 to £60. What is the percentage decrease?

    • 20%
    • 75%
    • 33.3%
    • 25%

  16. What does a 100% increase do to a number?

    • It halves it
    • It adds 1 to it
    • It doubles it
    • It stays the same

  17. The price of a game rises by 15% and then falls by 15%. What is the overall change?

    • A decrease of 2.25%
    • A decrease of 3%
    • No change at all
    • An increase of 2.25%

  18. A value falls from 75 to 60. What is the percentage change?

    • A decrease of 20%
    • An increase of 15%
    • A decrease of 25%
    • An increase of 20%

  19. A player's score rises from 32 to 40. What is the percentage increase?

    • 20%
    • 25%
    • 8%
    • 32%

  20. After a 30% discount, a game costs £21. What was its original price?

    • £27
    • £35
    • £30
    • £14.70

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