Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 660 · 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. 1.720 decreased by 15% =
2. 2.680 decreased by 15% =
3. 3.230 increased by 10% =
4. 4.288 decreased by 25% =
5. 5.725 increased by 12% =
6. 6.610 increased by 10% =
7. 7.440 decreased by 15% =
8. 8.240 increased by 20% =
9. 9.796 decreased by 25% =
10. 10.648 decreased by 75% =
11. 11.512 increased by 25% =
12. 12.152 increased by 50% =
13. 13.250 increased by 8% =
14. 14.200 decreased by 60% =
15. 15.260 decreased by 25% =
16. 16.775 decreased by 20% =
17. 17.760 decreased by 15% =
18. 18.505 increased by 60% =
19. 19.324 decreased by 25% =
20. 20.356 decreased by 25% =
21. 21.405 increased by 20% =
22. 22.775 increased by 12% =
23. 23.120 decreased by 30% =
24. 24.175 decreased by 8% =
25. 25.40 increased by 30% =
26. 26.460 increased by 5% =
27. 27.425 decreased by 60% =
28. 28.300 increased by 12% =
29. 29.250 increased by 40% =
30. 30.275 decreased by 12% =
31. 31.175 decreased by 12% =
32. 32.210 increased by 10% =
33. 33.300 increased by 12% =
34. 34.200 increased by 8% =
35. 35.725 decreased by 60% =
36. 36.606 increased by 50% =
37. 37.560 increased by 10% =
38. 38.40 increased by 50% =
39. 39.340 decreased by 15% =
40. 40.476 increased by 50% =

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