Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 18 · 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. 1.375 increased by 8% =
2. 2.450 increased by 12% =
3. 3.590 increased by 10% =
4. 4.460 decreased by 30% =
5. 5.520 decreased by 15% =
6. 6.140 increased by 35% =
7. 7.595 increased by 20% =
8. 8.420 increased by 15% =
9. 9.345 decreased by 40% =
10. 10.540 increased by 15% =
11. 11.575 decreased by 8% =
12. 12.568 increased by 25% =
13. 13.760 decreased by 35% =
14. 14.150 decreased by 8% =
15. 15.648 increased by 75% =
16. 16.350 increased by 12% =
17. 17.275 increased by 12% =
18. 18.64 decreased by 50% =
19. 19.740 increased by 60% =
20. 20.540 increased by 75% =
21. 21.780 decreased by 40% =
22. 22.520 decreased by 5% =
23. 23.180 decreased by 10% =
24. 24.220 increased by 35% =
25. 25.100 increased by 40% =
26. 26.248 decreased by 50% =
27. 27.238 decreased by 50% =
28. 28.145 decreased by 20% =
29. 29.215 decreased by 60% =
30. 30.50 decreased by 8% =
31. 31.252 increased by 25% =
32. 32.150 increased by 12% =
33. 33.780 increased by 5% =
34. 34.185 increased by 20% =
35. 35.704 decreased by 75% =
36. 36.40 increased by 5% =
37. 37.610 decreased by 10% =
38. 38.300 increased by 35% =
39. 39.420 increased by 5% =
40. 40.758 decreased by 50% =

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