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MathsAges 13-15

Percentage increase & decrease

Increase or decrease a starting value by a given percentage to find the new quantity. Review suitability for your learners before teaching.

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Age band:Ages 13-15 Ages 16-18

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Worksheet StudioPractice pack · Ages 13-15

Percentage increase & decrease

Take your time. Show your thinking.

1. Increase 60 by 50%.
60 · 50% · Percentage increase & decr…
2. Decrease 220 by 20%.
220 · 20% · Percentage increase & decr…
3. Decrease 40 by 40%.
40 · 40% · Percentage increase & decr…
4. Decrease 320 by 10%.
320 · 10% · Percentage increase & decr…
5. Decrease 60 by 30%.
60 · 30% · Percentage increase & decr…
6. Increase 140 by 50%.
140 · 50% · Percentage increase & decr…
7. Decrease 480 by 50%.
480 · 50% · Percentage increase & decr…
8. Decrease 500 by 25%.
500 · 25% · Percentage increase & decr…
9. Decrease 440 by 25%.
440 · 25% · Percentage increase & decr…
10. Increase 320 by 25%.
320 · 25% · Percentage increase & decr…
11. Increase 80 by 30%.
80 · 30% · Percentage increase & decr…
12. Decrease 80 by 30%.
80 · 30% · Percentage increase & decr…

12 questions · Seed 42 · Age guidance, not curriculum certification

View the answer key

Worksheet StudioAnswer key · Ages 13-15

Percentage increase & decrease

Answers and reasoning. Review before teaching.

1. Increase 60 by 50%.
90
50% of 60 is 30. 60 + 30 = 90.
2. Decrease 220 by 20%.
176
20% of 220 is 44. 220 − 44 = 176.
3. Decrease 40 by 40%.
24
40% of 40 is 16. 40 − 16 = 24.
4. Decrease 320 by 10%.
288
10% of 320 is 32. 320 − 32 = 288.
5. Decrease 60 by 30%.
42
30% of 60 is 18. 60 − 18 = 42.
6. Increase 140 by 50%.
210
50% of 140 is 70. 140 + 70 = 210.
7. Decrease 480 by 50%.
240
50% of 480 is 240. 480 − 240 = 240.
8. Decrease 500 by 25%.
375
25% of 500 is 125. 500 − 125 = 375.
9. Decrease 440 by 25%.
330
25% of 440 is 110. 440 − 110 = 330.
10. Increase 320 by 25%.
400
25% of 320 is 80. 320 + 80 = 400.
11. Increase 80 by 30%.
104
30% of 80 is 24. 80 + 24 = 104.
12. Decrease 80 by 30%.
56
30% of 80 is 24. 80 − 24 = 56.

12 questions · Seed 42 · Age guidance, not curriculum certification

Worksheet StudioPractice pack · Ages 13-15

Percentage increase & decrease

Take your time. Show your thinking.

1. Increase 60 by 50%.
60 · 50% · Percentage increase & decr…
2. Decrease 220 by 20%.
220 · 20% · Percentage increase & decr…
3. Decrease 40 by 40%.
40 · 40% · Percentage increase & decr…
4. Decrease 320 by 10%.
320 · 10% · Percentage increase & decr…
5. Decrease 60 by 30%.
60 · 30% · Percentage increase & decr…
6. Increase 140 by 50%.
140 · 50% · Percentage increase & decr…
7. Decrease 480 by 50%.
480 · 50% · Percentage increase & decr…
8. Decrease 500 by 25%.
500 · 25% · Percentage increase & decr…
9. Decrease 440 by 25%.
440 · 25% · Percentage increase & decr…
10. Increase 320 by 25%.
320 · 25% · Percentage increase & decr…
11. Increase 80 by 30%.
80 · 30% · Percentage increase & decr…
12. Decrease 80 by 30%.
80 · 30% · Percentage increase & decr…

12 questions · Seed 42 · Age guidance, not curriculum certification

Worksheet StudioAnswer key · Ages 13-15

Percentage increase & decrease

Answers and reasoning. Review before teaching.

1. Increase 60 by 50%.
90
50% of 60 is 30. 60 + 30 = 90.
2. Decrease 220 by 20%.
176
20% of 220 is 44. 220 − 44 = 176.
3. Decrease 40 by 40%.
24
40% of 40 is 16. 40 − 16 = 24.
4. Decrease 320 by 10%.
288
10% of 320 is 32. 320 − 32 = 288.
5. Decrease 60 by 30%.
42
30% of 60 is 18. 60 − 18 = 42.
6. Increase 140 by 50%.
210
50% of 140 is 70. 140 + 70 = 210.
7. Decrease 480 by 50%.
240
50% of 480 is 240. 480 − 240 = 240.
8. Decrease 500 by 25%.
375
25% of 500 is 125. 500 − 125 = 375.
9. Decrease 440 by 25%.
330
25% of 440 is 110. 440 − 110 = 330.
10. Increase 320 by 25%.
400
25% of 320 is 80. 320 + 80 = 400.
11. Increase 80 by 30%.
104
30% of 80 is 24. 80 + 24 = 104.
12. Decrease 80 by 30%.
56
30% of 80 is 24. 80 − 24 = 56.

12 questions · Seed 42 · Age guidance, not curriculum certification