Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 847 · 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. 1.380 decreased by 15% =
2. 2.535 decreased by 20% =
3. 3.420 decreased by 30% =
4. 4.225 increased by 8% =
5. 5.644 increased by 75% =
6. 6.220 increased by 75% =
7. 7.470 decreased by 30% =
8. 8.720 increased by 5% =
9. 9.585 increased by 20% =
10. 10.260 decreased by 10% =
11. 11.610 increased by 50% =
12. 12.600 decreased by 15% =
13. 13.60 increased by 5% =
14. 14.120 decreased by 35% =
15. 15.282 decreased by 50% =
16. 16.180 increased by 30% =
17. 17.475 increased by 12% =
18. 18.100 increased by 75% =
19. 19.620 increased by 5% =
20. 20.440 increased by 30% =
21. 21.785 increased by 60% =
22. 22.800 decreased by 35% =
23. 23.660 decreased by 10% =
24. 24.642 increased by 50% =
25. 25.480 increased by 5% =
26. 26.50 increased by 8% =
27. 27.380 increased by 35% =
28. 28.380 increased by 15% =
29. 29.75 decreased by 12% =
30. 30.800 decreased by 10% =
31. 31.762 decreased by 50% =
32. 32.180 increased by 35% =
33. 33.460 increased by 25% =
34. 34.475 decreased by 40% =
35. 35.300 decreased by 20% =
36. 36.435 decreased by 60% =
37. 37.680 increased by 5% =
38. 38.495 increased by 20% =
39. 39.600 decreased by 30% =
40. 40.720 increased by 15% =

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