Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 914 · 40 questions

The fast method (One-step multiplier): Increase by p%: multiply by (100 + p)% — up 20% is × 1.2. Decrease by p%: multiply by (100 − p)% — down 25% is × 0.75. Easy way to multiply: × the whole number (115 or 75), then ÷ 100.

1. 1.165 decreased by 20% =
2. 2.140 decreased by 35% =
3. 3.520 decreased by 15% =
4. 4.125 decreased by 20% =
5. 5.276 decreased by 25% =
6. 6.380 decreased by 30% =
7. 7.40 increased by 5% =
8. 8.550 decreased by 12% =
9. 9.320 increased by 5% =
10. 10.90 increased by 10% =
11. 11.225 increased by 60% =
12. 12.420 increased by 5% =
13. 13.776 decreased by 75% =
14. 14.764 increased by 50% =
15. 15.770 increased by 40% =
16. 16.360 increased by 15% =
17. 17.670 decreased by 20% =
18. 18.180 decreased by 10% =
19. 19.228 increased by 50% =
20. 20.564 decreased by 75% =
21. 21.580 decreased by 60% =
22. 22.105 decreased by 20% =
23. 23.235 increased by 60% =
24. 24.360 increased by 40% =
25. 25.140 decreased by 10% =
26. 26.160 increased by 10% =
27. 27.360 decreased by 15% =
28. 28.716 decreased by 75% =
29. 29.430 increased by 30% =
30. 30.200 increased by 35% =
31. 31.716 increased by 75% =
32. 32.720 decreased by 15% =
33. 33.192 decreased by 25% =
34. 34.550 increased by 20% =
35. 35.320 decreased by 5% =
36. 36.270 decreased by 40% =
37. 37.286 increased by 50% =
38. 38.270 increased by 50% =
39. 39.180 increased by 30% =
40. 40.730 decreased by 30% =

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