Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 108 · 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. 1.355 increased by 20% =
2. 2.660 decreased by 5% =
3. 3.700 increased by 35% =
4. 4.320 decreased by 30% =
5. 5.150 increased by 8% =
6. 6.200 increased by 12% =
7. 7.115 decreased by 20% =
8. 8.740 decreased by 15% =
9. 9.470 increased by 10% =
10. 10.475 increased by 12% =
11. 11.60 increased by 30% =
12. 12.588 increased by 25% =
13. 13.585 increased by 40% =
14. 14.480 increased by 5% =
15. 15.72 increased by 75% =
16. 16.340 increased by 60% =
17. 17.60 increased by 5% =
18. 18.586 increased by 50% =
19. 19.40 decreased by 40% =
20. 20.280 decreased by 75% =
21. 21.450 decreased by 10% =
22. 22.402 increased by 50% =
23. 23.550 increased by 30% =
24. 24.740 decreased by 5% =
25. 25.80 increased by 15% =
26. 26.380 increased by 75% =
27. 27.170 increased by 40% =
28. 28.405 decreased by 60% =
29. 29.120 increased by 75% =
30. 30.660 increased by 30% =
31. 31.140 increased by 15% =
32. 32.120 decreased by 35% =
33. 33.660 increased by 10% =
34. 34.172 decreased by 25% =
35. 35.100 increased by 5% =
36. 36.520 decreased by 60% =
37. 37.225 increased by 12% =
38. 38.650 decreased by 8% =
39. 39.246 increased by 50% =
40. 40.516 increased by 75% =

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