Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 676 · 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. 1.295 decreased by 20% =
2. 2.516 decreased by 75% =
3. 3.775 decreased by 20% =
4. 4.254 increased by 50% =
5. 5.770 increased by 30% =
6. 6.605 decreased by 20% =
7. 7.530 decreased by 30% =
8. 8.50 decreased by 8% =
9. 9.700 decreased by 5% =
10. 10.360 increased by 35% =
11. 11.200 increased by 35% =
12. 12.130 increased by 60% =
13. 13.636 increased by 25% =
14. 14.590 increased by 10% =
15. 15.388 increased by 50% =
16. 16.240 decreased by 40% =
17. 17.450 decreased by 8% =
18. 18.155 increased by 60% =
19. 19.220 increased by 15% =
20. 20.150 decreased by 8% =
21. 21.260 decreased by 10% =
22. 22.580 increased by 10% =
23. 23.204 increased by 75% =
24. 24.440 increased by 15% =
25. 25.520 decreased by 15% =
26. 26.730 decreased by 30% =
27. 27.404 increased by 25% =
28. 28.715 increased by 20% =
29. 29.768 decreased by 25% =
30. 30.744 decreased by 75% =
31. 31.550 increased by 12% =
32. 32.120 increased by 35% =
33. 33.475 increased by 8% =
34. 34.396 increased by 25% =
35. 35.480 increased by 15% =
36. 36.70 increased by 10% =
37. 37.600 decreased by 15% =
38. 38.546 increased by 50% =
39. 39.120 decreased by 15% =
40. 40.625 decreased by 20% =

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