Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 139 · 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. 1.75 decreased by 12% =
2. 2.500 decreased by 5% =
3. 3.470 decreased by 10% =
4. 4.160 increased by 15% =
5. 5.560 decreased by 35% =
6. 6.85 decreased by 40% =
7. 7.240 decreased by 35% =
8. 8.232 increased by 50% =
9. 9.220 increased by 15% =
10. 10.230 decreased by 40% =
11. 11.150 decreased by 12% =
12. 12.720 increased by 60% =
13. 13.180 increased by 30% =
14. 14.740 increased by 5% =
15. 15.80 increased by 15% =
16. 16.508 increased by 50% =
17. 17.600 decreased by 15% =
18. 18.275 increased by 12% =
19. 19.75 increased by 12% =
20. 20.560 decreased by 15% =
21. 21.500 decreased by 30% =
22. 22.532 increased by 25% =
23. 23.620 decreased by 60% =
24. 24.625 increased by 60% =
25. 25.760 increased by 5% =
26. 26.480 increased by 5% =
27. 27.440 increased by 20% =
28. 28.590 decreased by 20% =
29. 29.375 decreased by 12% =
30. 30.320 increased by 10% =
31. 31.630 increased by 40% =
32. 32.120 decreased by 15% =
33. 33.120 increased by 15% =
34. 34.640 decreased by 15% =
35. 35.440 increased by 30% =
36. 36.432 increased by 25% =
37. 37.610 decreased by 30% =
38. 38.560 increased by 35% =
39. 39.590 decreased by 30% =
40. 40.385 decreased by 60% =

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