Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 114 · 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. 1.98 increased by 50% =
2. 2.520 increased by 15% =
3. 3.120 increased by 20% =
4. 4.95 increased by 60% =
5. 5.390 increased by 30% =
6. 6.725 increased by 8% =
7. 7.210 increased by 10% =
8. 8.425 decreased by 40% =
9. 9.680 increased by 15% =
10. 10.220 increased by 40% =
11. 11.425 decreased by 8% =
12. 12.615 decreased by 20% =
13. 13.230 decreased by 60% =
14. 14.238 decreased by 50% =
15. 15.220 decreased by 40% =
16. 16.540 decreased by 35% =
17. 17.260 decreased by 50% =
18. 18.200 increased by 10% =
19. 19.144 increased by 25% =
20. 20.424 increased by 25% =
21. 21.598 increased by 50% =
22. 22.75 increased by 8% =
23. 23.584 decreased by 25% =
24. 24.350 decreased by 12% =
25. 25.490 increased by 20% =
26. 26.140 decreased by 35% =
27. 27.405 increased by 20% =
28. 28.40 increased by 35% =
29. 29.610 increased by 20% =
30. 30.700 increased by 35% =
31. 31.505 decreased by 20% =
32. 32.600 increased by 12% =
33. 33.730 decreased by 60% =
34. 34.740 increased by 15% =
35. 35.700 increased by 8% =
36. 36.125 decreased by 8% =
37. 37.752 increased by 25% =
38. 38.40 decreased by 60% =
39. 39.760 decreased by 10% =
40. 40.220 decreased by 10% =

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