Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 193 · 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. 1.450 decreased by 60% =
2. 2.52 increased by 75% =
3. 3.220 decreased by 20% =
4. 4.755 increased by 40% =
5. 5.620 increased by 10% =
6. 6.288 decreased by 25% =
7. 7.200 increased by 35% =
8. 8.370 increased by 40% =
9. 9.425 increased by 12% =
10. 10.662 increased by 50% =
11. 11.560 increased by 5% =
12. 12.440 increased by 15% =
13. 13.140 increased by 20% =
14. 14.580 increased by 10% =
15. 15.515 increased by 20% =
16. 16.434 increased by 50% =
17. 17.420 decreased by 30% =
18. 18.720 increased by 10% =
19. 19.100 increased by 50% =
20. 20.175 decreased by 12% =
21. 21.175 decreased by 12% =
22. 22.645 increased by 60% =
23. 23.750 decreased by 20% =
24. 24.275 decreased by 8% =
25. 25.790 increased by 30% =
26. 26.165 decreased by 60% =
27. 27.440 decreased by 10% =
28. 28.648 decreased by 25% =
29. 29.120 decreased by 10% =
30. 30.740 increased by 75% =
31. 31.68 increased by 75% =
32. 32.140 decreased by 75% =
33. 33.448 decreased by 75% =
34. 34.400 decreased by 35% =
35. 35.286 increased by 50% =
36. 36.720 increased by 15% =
37. 37.200 increased by 8% =
38. 38.530 decreased by 20% =
39. 39.140 increased by 35% =
40. 40.370 increased by 10% =

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