Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 912 · 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. 1.645 decreased by 20% =
2. 2.175 increased by 12% =
3. 3.75 decreased by 12% =
4. 4.720 increased by 30% =
5. 5.40 decreased by 35% =
6. 6.790 increased by 10% =
7. 7.210 increased by 20% =
8. 8.580 decreased by 35% =
9. 9.75 increased by 60% =
10. 10.40 increased by 5% =
11. 11.465 increased by 20% =
12. 12.480 increased by 10% =
13. 13.775 decreased by 20% =
14. 14.775 decreased by 40% =
15. 15.562 decreased by 50% =
16. 16.485 decreased by 20% =
17. 17.418 increased by 50% =
18. 18.790 decreased by 20% =
19. 19.265 increased by 20% =
20. 20.486 decreased by 50% =
21. 21.180 decreased by 10% =
22. 22.470 decreased by 20% =
23. 23.480 increased by 35% =
24. 24.530 increased by 30% =
25. 25.175 decreased by 40% =
26. 26.350 decreased by 10% =
27. 27.660 decreased by 35% =
28. 28.72 decreased by 50% =
29. 29.260 decreased by 35% =
30. 30.160 increased by 5% =
31. 31.325 increased by 60% =
32. 32.142 decreased by 50% =
33. 33.320 decreased by 40% =
34. 34.200 increased by 8% =
35. 35.220 increased by 25% =
36. 36.780 increased by 15% =
37. 37.72 decreased by 75% =
38. 38.480 increased by 60% =
39. 39.120 increased by 10% =
40. 40.380 increased by 15% =

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