Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 945 · 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. 1.275 decreased by 20% =
2. 2.770 decreased by 40% =
3. 3.692 increased by 25% =
4. 4.325 increased by 8% =
5. 5.40 increased by 5% =
6. 6.465 decreased by 60% =
7. 7.380 decreased by 15% =
8. 8.590 increased by 20% =
9. 9.135 increased by 60% =
10. 10.224 decreased by 75% =
11. 11.710 increased by 30% =
12. 12.765 decreased by 20% =
13. 13.400 increased by 15% =
14. 14.575 decreased by 8% =
15. 15.360 decreased by 5% =
16. 16.234 increased by 50% =
17. 17.540 decreased by 20% =
18. 18.675 decreased by 12% =
19. 19.540 increased by 15% =
20. 20.100 increased by 5% =
21. 21.600 decreased by 5% =
22. 22.190 decreased by 30% =
23. 23.40 decreased by 10% =
24. 24.190 increased by 40% =
25. 25.668 increased by 25% =
26. 26.340 decreased by 10% =
27. 27.416 decreased by 50% =
28. 28.732 decreased by 25% =
29. 29.610 increased by 30% =
30. 30.480 increased by 35% =
31. 31.300 increased by 8% =
32. 32.375 increased by 8% =
33. 33.640 decreased by 35% =
34. 34.200 decreased by 35% =
35. 35.120 decreased by 35% =
36. 36.240 increased by 5% =
37. 37.50 decreased by 8% =
38. 38.252 decreased by 75% =
39. 39.440 increased by 20% =
40. 40.745 decreased by 40% =

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