Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 845 · 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. 1.464 decreased by 75% =
2. 2.800 decreased by 30% =
3. 3.310 decreased by 20% =
4. 4.180 decreased by 10% =
5. 5.252 decreased by 25% =
6. 6.725 decreased by 60% =
7. 7.65 increased by 20% =
8. 8.705 increased by 40% =
9. 9.552 decreased by 75% =
10. 10.495 increased by 60% =
11. 11.520 decreased by 20% =
12. 12.612 decreased by 25% =
13. 13.275 decreased by 12% =
14. 14.244 increased by 75% =
15. 15.550 increased by 10% =
16. 16.650 decreased by 30% =
17. 17.290 increased by 30% =
18. 18.80 increased by 30% =
19. 19.250 increased by 12% =
20. 20.790 increased by 30% =
21. 21.540 decreased by 75% =
22. 22.260 decreased by 5% =
23. 23.340 increased by 15% =
24. 24.365 increased by 20% =
25. 25.695 increased by 40% =
26. 26.340 decreased by 5% =
27. 27.200 increased by 10% =
28. 28.760 decreased by 5% =
29. 29.350 decreased by 60% =
30. 30.310 increased by 10% =
31. 31.120 decreased by 10% =
32. 32.100 decreased by 15% =
33. 33.525 increased by 8% =
34. 34.625 decreased by 8% =
35. 35.364 decreased by 50% =
36. 36.325 decreased by 8% =
37. 37.750 decreased by 10% =
38. 38.460 increased by 25% =
39. 39.275 decreased by 20% =
40. 40.490 increased by 10% =

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