Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 802 · 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. 1.160 decreased by 10% =
2. 2.350 decreased by 12% =
3. 3.410 decreased by 20% =
4. 4.460 decreased by 5% =
5. 5.100 increased by 30% =
6. 6.70 increased by 10% =
7. 7.585 decreased by 20% =
8. 8.400 decreased by 30% =
9. 9.195 increased by 20% =
10. 10.800 increased by 10% =
11. 11.770 increased by 40% =
12. 12.450 increased by 40% =
13. 13.725 increased by 8% =
14. 14.735 increased by 60% =
15. 15.790 decreased by 40% =
16. 16.460 increased by 20% =
17. 17.550 increased by 12% =
18. 18.420 increased by 25% =
19. 19.460 decreased by 10% =
20. 20.456 decreased by 25% =
21. 21.760 decreased by 35% =
22. 22.405 decreased by 60% =
23. 23.75 increased by 12% =
24. 24.268 decreased by 25% =
25. 25.460 increased by 5% =
26. 26.150 decreased by 12% =
27. 27.260 decreased by 35% =
28. 28.700 decreased by 8% =
29. 29.248 increased by 75% =
30. 30.460 decreased by 5% =
31. 31.552 decreased by 25% =
32. 32.590 increased by 10% =
33. 33.148 increased by 75% =
34. 34.440 increased by 15% =
35. 35.245 decreased by 20% =
36. 36.170 increased by 20% =
37. 37.600 decreased by 8% =
38. 38.325 decreased by 12% =
39. 39.540 decreased by 10% =
40. 40.312 increased by 25% =

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