Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 243 · 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. 1.388 decreased by 25% =
2. 2.780 decreased by 25% =
3. 3.640 decreased by 30% =
4. 4.150 increased by 20% =
5. 5.40 decreased by 20% =
6. 6.350 increased by 10% =
7. 7.200 decreased by 12% =
8. 8.475 increased by 20% =
9. 9.150 decreased by 12% =
10. 10.135 increased by 40% =
11. 11.385 decreased by 40% =
12. 12.630 increased by 40% =
13. 13.55 increased by 40% =
14. 14.555 increased by 20% =
15. 15.625 increased by 12% =
16. 16.125 increased by 8% =
17. 17.680 decreased by 15% =
18. 18.140 increased by 15% =
19. 19.220 increased by 75% =
20. 20.660 increased by 15% =
21. 21.180 decreased by 15% =
22. 22.480 increased by 25% =
23. 23.70 decreased by 10% =
24. 24.75 increased by 8% =
25. 25.110 decreased by 40% =
26. 26.308 increased by 75% =
27. 27.660 decreased by 5% =
28. 28.320 decreased by 20% =
29. 29.588 decreased by 75% =
30. 30.225 decreased by 8% =
31. 31.160 decreased by 35% =
32. 32.520 increased by 10% =
33. 33.500 increased by 5% =
34. 34.316 increased by 75% =
35. 35.530 increased by 10% =
36. 36.560 increased by 35% =
37. 37.660 decreased by 5% =
38. 38.750 increased by 40% =
39. 39.540 increased by 5% =
40. 40.525 increased by 8% =

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