Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 907 · 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. 1.100 increased by 35% =
2. 2.640 increased by 15% =
3. 3.240 increased by 35% =
4. 4.310 decreased by 30% =
5. 5.440 increased by 15% =
6. 6.230 increased by 40% =
7. 7.120 increased by 35% =
8. 8.230 decreased by 30% =
9. 9.620 increased by 15% =
10. 10.180 decreased by 30% =
11. 11.220 increased by 35% =
12. 12.290 increased by 30% =
13. 13.300 increased by 5% =
14. 14.200 increased by 12% =
15. 15.730 increased by 60% =
16. 16.230 decreased by 60% =
17. 17.260 increased by 5% =
18. 18.530 decreased by 10% =
19. 19.660 decreased by 35% =
20. 20.120 increased by 5% =
21. 21.520 increased by 15% =
22. 22.676 increased by 75% =
23. 23.685 increased by 60% =
24. 24.170 decreased by 20% =
25. 25.72 increased by 25% =
26. 26.575 increased by 12% =
27. 27.348 decreased by 50% =
28. 28.90 increased by 30% =
29. 29.760 decreased by 25% =
30. 30.220 decreased by 5% =
31. 31.125 decreased by 40% =
32. 32.260 increased by 40% =
33. 33.700 decreased by 15% =
34. 34.480 decreased by 40% =
35. 35.700 decreased by 12% =
36. 36.726 decreased by 50% =
37. 37.460 decreased by 15% =
38. 38.720 decreased by 5% =
39. 39.165 increased by 20% =
40. 40.40 decreased by 15% =

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