Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 526 · 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. 1.600 decreased by 5% =
2. 2.510 decreased by 10% =
3. 3.700 increased by 15% =
4. 4.285 decreased by 20% =
5. 5.144 decreased by 25% =
6. 6.460 increased by 15% =
7. 7.150 decreased by 30% =
8. 8.600 increased by 15% =
9. 9.280 increased by 15% =
10. 10.430 decreased by 10% =
11. 11.680 decreased by 35% =
12. 12.690 increased by 30% =
13. 13.660 increased by 5% =
14. 14.464 increased by 25% =
15. 15.744 decreased by 75% =
16. 16.280 decreased by 35% =
17. 17.252 increased by 25% =
18. 18.396 decreased by 50% =
19. 19.50 decreased by 60% =
20. 20.476 increased by 25% =
21. 21.256 decreased by 25% =
22. 22.265 decreased by 20% =
23. 23.140 decreased by 10% =
24. 24.600 increased by 35% =
25. 25.800 decreased by 30% =
26. 26.340 decreased by 35% =
27. 27.496 decreased by 25% =
28. 28.235 decreased by 60% =
29. 29.470 increased by 10% =
30. 30.790 increased by 30% =
31. 31.400 increased by 8% =
32. 32.612 decreased by 75% =
33. 33.280 decreased by 15% =
34. 34.275 increased by 12% =
35. 35.680 decreased by 5% =
36. 36.120 decreased by 25% =
37. 37.695 increased by 40% =
38. 38.710 decreased by 20% =
39. 39.154 increased by 50% =
40. 40.635 decreased by 60% =

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