Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 564 · 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. 1.120 increased by 20% =
2. 2.560 decreased by 5% =
3. 3.540 decreased by 35% =
4. 4.714 decreased by 50% =
5. 5.540 increased by 15% =
6. 6.84 increased by 75% =
7. 7.700 increased by 10% =
8. 8.200 increased by 20% =
9. 9.760 decreased by 15% =
10. 10.495 increased by 60% =
11. 11.780 increased by 35% =
12. 12.260 increased by 25% =
13. 13.412 increased by 50% =
14. 14.115 decreased by 60% =
15. 15.575 decreased by 8% =
16. 16.760 increased by 15% =
17. 17.790 decreased by 30% =
18. 18.128 decreased by 75% =
19. 19.470 decreased by 10% =
20. 20.680 increased by 35% =
21. 21.380 increased by 5% =
22. 22.775 increased by 40% =
23. 23.360 decreased by 5% =
24. 24.75 decreased by 8% =
25. 25.80 decreased by 15% =
26. 26.615 decreased by 60% =
27. 27.470 increased by 40% =
28. 28.420 increased by 15% =
29. 29.545 increased by 60% =
30. 30.80 decreased by 35% =
31. 31.100 increased by 30% =
32. 32.205 decreased by 40% =
33. 33.98 decreased by 50% =
34. 34.748 increased by 50% =
35. 35.555 decreased by 20% =
36. 36.240 increased by 15% =
37. 37.600 decreased by 10% =
38. 38.500 increased by 12% =
39. 39.668 increased by 25% =
40. 40.325 increased by 8% =

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