Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 597 · 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. 1.240 decreased by 5% =
2. 2.640 increased by 20% =
3. 3.785 increased by 40% =
4. 4.80 increased by 35% =
5. 5.70 decreased by 30% =
6. 6.530 increased by 30% =
7. 7.160 increased by 35% =
8. 8.60 increased by 15% =
9. 9.415 decreased by 40% =
10. 10.110 increased by 60% =
11. 11.40 decreased by 5% =
12. 12.150 increased by 12% =
13. 13.742 decreased by 50% =
14. 14.480 increased by 20% =
15. 15.260 decreased by 10% =
16. 16.720 decreased by 5% =
17. 17.275 increased by 60% =
18. 18.784 decreased by 75% =
19. 19.680 increased by 5% =
20. 20.760 increased by 10% =
21. 21.75 decreased by 20% =
22. 22.490 decreased by 10% =
23. 23.390 increased by 10% =
24. 24.460 decreased by 30% =
25. 25.80 increased by 35% =
26. 26.720 increased by 15% =
27. 27.390 decreased by 20% =
28. 28.560 increased by 60% =
29. 29.706 increased by 50% =
30. 30.300 increased by 10% =
31. 31.275 increased by 12% =
32. 32.726 increased by 50% =
33. 33.100 decreased by 20% =
34. 34.440 decreased by 20% =
35. 35.40 decreased by 40% =
36. 36.725 decreased by 12% =
37. 37.680 increased by 10% =
38. 38.700 decreased by 30% =
39. 39.475 decreased by 12% =
40. 40.135 increased by 60% =

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