Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 409 · 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. 1.530 decreased by 10% =
2. 2.450 decreased by 8% =
3. 3.218 increased by 50% =
4. 4.300 increased by 35% =
5. 5.472 increased by 75% =
6. 6.730 increased by 60% =
7. 7.275 decreased by 40% =
8. 8.280 increased by 10% =
9. 9.790 decreased by 40% =
10. 10.115 increased by 40% =
11. 11.800 decreased by 5% =
12. 12.755 increased by 20% =
13. 13.155 increased by 60% =
14. 14.380 decreased by 15% =
15. 15.650 increased by 20% =
16. 16.440 decreased by 15% =
17. 17.40 increased by 25% =
18. 18.172 increased by 75% =
19. 19.70 increased by 30% =
20. 20.660 increased by 5% =
21. 21.740 increased by 5% =
22. 22.375 decreased by 8% =
23. 23.610 decreased by 10% =
24. 24.800 decreased by 15% =
25. 25.132 increased by 75% =
26. 26.576 decreased by 75% =
27. 27.344 increased by 75% =
28. 28.465 increased by 40% =
29. 29.785 decreased by 20% =
30. 30.700 increased by 35% =
31. 31.620 decreased by 50% =
32. 32.218 increased by 50% =
33. 33.520 decreased by 5% =
34. 34.120 increased by 20% =
35. 35.225 increased by 12% =
36. 36.702 decreased by 50% =
37. 37.200 increased by 5% =
38. 38.680 increased by 30% =
39. 39.650 decreased by 12% =
40. 40.220 decreased by 30% =

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