Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 121 · 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. 1.178 decreased by 50% =
2. 2.396 decreased by 25% =
3. 3.480 increased by 35% =
4. 4.170 increased by 30% =
5. 5.128 increased by 25% =
6. 6.275 increased by 20% =
7. 7.230 decreased by 30% =
8. 8.660 decreased by 5% =
9. 9.125 increased by 12% =
10. 10.40 increased by 5% =
11. 11.470 decreased by 10% =
12. 12.800 increased by 15% =
13. 13.170 increased by 30% =
14. 14.225 increased by 8% =
15. 15.566 increased by 50% =
16. 16.295 increased by 40% =
17. 17.200 decreased by 35% =
18. 18.425 decreased by 12% =
19. 19.680 decreased by 60% =
20. 20.575 decreased by 20% =
21. 21.680 increased by 15% =
22. 22.370 decreased by 10% =
23. 23.140 decreased by 15% =
24. 24.685 increased by 20% =
25. 25.300 decreased by 12% =
26. 26.490 decreased by 60% =
27. 27.620 increased by 50% =
28. 28.370 increased by 10% =
29. 29.200 decreased by 10% =
30. 30.250 increased by 12% =
31. 31.260 decreased by 60% =
32. 32.152 increased by 75% =
33. 33.720 decreased by 35% =
34. 34.340 decreased by 35% =
35. 35.224 increased by 50% =
36. 36.216 decreased by 25% =
37. 37.410 increased by 30% =
38. 38.475 increased by 8% =
39. 39.705 decreased by 20% =
40. 40.520 increased by 75% =

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