Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 89 · 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. 1.50 increased by 8% =
2. 2.44 increased by 25% =
3. 3.400 decreased by 25% =
4. 4.515 increased by 60% =
5. 5.248 increased by 25% =
6. 6.110 decreased by 30% =
7. 7.240 decreased by 10% =
8. 8.40 decreased by 15% =
9. 9.120 decreased by 10% =
10. 10.260 increased by 5% =
11. 11.420 increased by 20% =
12. 12.520 increased by 30% =
13. 13.720 decreased by 5% =
14. 14.420 decreased by 10% =
15. 15.798 decreased by 50% =
16. 16.68 decreased by 75% =
17. 17.460 increased by 35% =
18. 18.590 decreased by 40% =
19. 19.660 decreased by 10% =
20. 20.660 increased by 25% =
21. 21.440 increased by 35% =
22. 22.240 increased by 35% =
23. 23.40 decreased by 15% =
24. 24.280 increased by 35% =
25. 25.660 increased by 20% =
26. 26.64 increased by 50% =
27. 27.435 decreased by 20% =
28. 28.480 increased by 30% =
29. 29.420 decreased by 15% =
30. 30.295 decreased by 40% =
31. 31.52 decreased by 75% =
32. 32.585 decreased by 60% =
33. 33.56 increased by 75% =
34. 34.740 increased by 15% =
35. 35.220 increased by 5% =
36. 36.240 decreased by 15% =
37. 37.320 increased by 35% =
38. 38.640 increased by 20% =
39. 39.370 decreased by 20% =
40. 40.612 decreased by 75% =

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