Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 690 · 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. 1.640 decreased by 10% =
2. 2.275 decreased by 12% =
3. 3.750 decreased by 30% =
4. 4.690 increased by 10% =
5. 5.175 increased by 20% =
6. 6.500 increased by 35% =
7. 7.404 decreased by 75% =
8. 8.300 decreased by 60% =
9. 9.736 increased by 75% =
10. 10.440 decreased by 25% =
11. 11.790 decreased by 30% =
12. 12.380 increased by 5% =
13. 13.720 increased by 75% =
14. 14.140 increased by 15% =
15. 15.80 decreased by 15% =
16. 16.225 increased by 8% =
17. 17.400 decreased by 75% =
18. 18.540 increased by 15% =
19. 19.225 decreased by 12% =
20. 20.140 increased by 5% =
21. 21.120 increased by 20% =
22. 22.120 decreased by 5% =
23. 23.90 increased by 30% =
24. 24.625 decreased by 40% =
25. 25.755 decreased by 20% =
26. 26.400 increased by 12% =
27. 27.568 decreased by 25% =
28. 28.644 increased by 25% =
29. 29.400 decreased by 8% =
30. 30.665 increased by 40% =
31. 31.475 increased by 20% =
32. 32.500 decreased by 30% =
33. 33.350 decreased by 8% =
34. 34.625 decreased by 60% =
35. 35.730 decreased by 10% =
36. 36.180 increased by 15% =
37. 37.200 decreased by 5% =
38. 38.710 increased by 20% =
39. 39.268 decreased by 25% =
40. 40.420 decreased by 10% =

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