Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 366 · 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. 1.172 increased by 50% =
2. 2.90 increased by 40% =
3. 3.182 decreased by 50% =
4. 4.560 increased by 10% =
5. 5.320 increased by 5% =
6. 6.750 increased by 8% =
7. 7.670 decreased by 10% =
8. 8.120 increased by 15% =
9. 9.110 decreased by 10% =
10. 10.450 increased by 8% =
11. 11.212 increased by 50% =
12. 12.570 increased by 40% =
13. 13.140 increased by 5% =
14. 14.740 decreased by 75% =
15. 15.760 increased by 25% =
16. 16.415 increased by 40% =
17. 17.728 increased by 50% =
18. 18.250 increased by 8% =
19. 19.430 decreased by 40% =
20. 20.200 decreased by 15% =
21. 21.525 decreased by 12% =
22. 22.660 increased by 15% =
23. 23.225 decreased by 20% =
24. 24.440 increased by 5% =
25. 25.160 decreased by 20% =
26. 26.250 increased by 8% =
27. 27.760 increased by 30% =
28. 28.800 increased by 40% =
29. 29.786 decreased by 50% =
30. 30.256 increased by 75% =
31. 31.70 decreased by 20% =
32. 32.750 decreased by 30% =
33. 33.550 decreased by 10% =
34. 34.640 increased by 5% =
35. 35.440 decreased by 30% =
36. 36.80 increased by 5% =
37. 37.320 decreased by 5% =
38. 38.730 decreased by 10% =
39. 39.460 increased by 25% =
40. 40.80 increased by 60% =

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