Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 147 · 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. 1.275 increased by 8% =
2. 2.126 decreased by 50% =
3. 3.540 decreased by 5% =
4. 4.710 increased by 10% =
5. 5.40 increased by 5% =
6. 6.780 decreased by 35% =
7. 7.60 increased by 20% =
8. 8.650 increased by 30% =
9. 9.95 increased by 20% =
10. 10.240 decreased by 30% =
11. 11.525 increased by 12% =
12. 12.560 increased by 25% =
13. 13.245 increased by 60% =
14. 14.584 decreased by 50% =
15. 15.330 decreased by 20% =
16. 16.260 increased by 5% =
17. 17.185 increased by 60% =
18. 18.105 increased by 60% =
19. 19.360 increased by 15% =
20. 20.40 decreased by 5% =
21. 21.180 increased by 5% =
22. 22.492 decreased by 50% =
23. 23.600 increased by 15% =
24. 24.160 decreased by 35% =
25. 25.436 decreased by 75% =
26. 26.675 decreased by 8% =
27. 27.615 increased by 40% =
28. 28.450 decreased by 8% =
29. 29.325 decreased by 12% =
30. 30.100 increased by 35% =
31. 31.576 decreased by 25% =
32. 32.440 increased by 35% =
33. 33.525 decreased by 40% =
34. 34.100 decreased by 30% =
35. 35.120 increased by 35% =
36. 36.200 increased by 40% =
37. 37.296 increased by 50% =
38. 38.400 decreased by 5% =
39. 39.210 increased by 50% =
40. 40.600 decreased by 12% =

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