Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 134 · 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. 1.598 increased by 50% =
2. 2.640 decreased by 5% =
3. 3.182 decreased by 50% =
4. 4.575 increased by 8% =
5. 5.780 decreased by 35% =
6. 6.330 increased by 30% =
7. 7.320 decreased by 15% =
8. 8.352 increased by 75% =
9. 9.584 increased by 25% =
10. 10.460 decreased by 35% =
11. 11.675 increased by 8% =
12. 12.180 increased by 5% =
13. 13.165 decreased by 20% =
14. 14.200 decreased by 12% =
15. 15.535 decreased by 20% =
16. 16.800 increased by 8% =
17. 17.170 increased by 40% =
18. 18.260 decreased by 35% =
19. 19.485 increased by 20% =
20. 20.530 decreased by 10% =
21. 21.65 decreased by 20% =
22. 22.645 decreased by 20% =
23. 23.564 increased by 75% =
24. 24.316 increased by 25% =
25. 25.80 decreased by 15% =
26. 26.320 decreased by 15% =
27. 27.60 decreased by 15% =
28. 28.275 decreased by 12% =
29. 29.768 decreased by 50% =
30. 30.120 decreased by 5% =
31. 31.520 decreased by 50% =
32. 32.375 decreased by 12% =
33. 33.780 decreased by 10% =
34. 34.300 decreased by 50% =
35. 35.440 increased by 30% =
36. 36.585 decreased by 40% =
37. 37.470 decreased by 10% =
38. 38.365 decreased by 20% =
39. 39.600 increased by 25% =
40. 40.765 increased by 20% =

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