Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 833 · 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. 1.485 decreased by 20% =
2. 2.530 increased by 40% =
3. 3.220 decreased by 40% =
4. 4.40 increased by 15% =
5. 5.715 decreased by 60% =
6. 6.476 increased by 50% =
7. 7.240 decreased by 15% =
8. 8.600 increased by 10% =
9. 9.720 increased by 30% =
10. 10.760 increased by 15% =
11. 11.480 decreased by 10% =
12. 12.640 decreased by 15% =
13. 13.164 decreased by 25% =
14. 14.135 increased by 60% =
15. 15.340 decreased by 10% =
16. 16.280 increased by 15% =
17. 17.700 increased by 35% =
18. 18.390 decreased by 30% =
19. 19.84 decreased by 75% =
20. 20.215 decreased by 20% =
21. 21.440 increased by 30% =
22. 22.625 increased by 12% =
23. 23.60 increased by 15% =
24. 24.600 increased by 35% =
25. 25.575 increased by 8% =
26. 26.640 increased by 5% =
27. 27.60 increased by 5% =
28. 28.178 decreased by 50% =
29. 29.390 increased by 40% =
30. 30.430 decreased by 20% =
31. 31.716 decreased by 50% =
32. 32.355 decreased by 40% =
33. 33.280 increased by 5% =
34. 34.555 increased by 40% =
35. 35.325 decreased by 12% =
36. 36.695 decreased by 60% =
37. 37.290 increased by 20% =
38. 38.460 increased by 5% =
39. 39.300 decreased by 15% =
40. 40.430 increased by 10% =

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