Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 654 · 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. 1.760 decreased by 20% =
2. 2.775 increased by 8% =
3. 3.265 decreased by 60% =
4. 4.374 increased by 50% =
5. 5.100 decreased by 40% =
6. 6.336 decreased by 75% =
7. 7.495 decreased by 40% =
8. 8.540 increased by 15% =
9. 9.570 decreased by 10% =
10. 10.790 increased by 50% =
11. 11.425 decreased by 12% =
12. 12.68 increased by 25% =
13. 13.388 increased by 25% =
14. 14.250 decreased by 8% =
15. 15.240 decreased by 30% =
16. 16.640 decreased by 35% =
17. 17.660 decreased by 5% =
18. 18.750 decreased by 8% =
19. 19.540 increased by 10% =
20. 20.460 increased by 15% =
21. 21.500 decreased by 35% =
22. 22.430 increased by 30% =
23. 23.435 increased by 20% =
24. 24.150 decreased by 30% =
25. 25.462 increased by 50% =
26. 26.450 increased by 20% =
27. 27.460 decreased by 15% =
28. 28.530 increased by 30% =
29. 29.290 increased by 10% =
30. 30.205 decreased by 40% =
31. 31.750 increased by 10% =
32. 32.358 increased by 50% =
33. 33.100 increased by 30% =
34. 34.485 decreased by 60% =
35. 35.670 decreased by 60% =
36. 36.224 increased by 75% =
37. 37.304 decreased by 75% =
38. 38.660 decreased by 35% =
39. 39.440 increased by 10% =
40. 40.596 increased by 50% =

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