Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 405 · 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. 1.150 increased by 12% =
2. 2.160 increased by 5% =
3. 3.536 increased by 75% =
4. 4.50 decreased by 20% =
5. 5.620 increased by 5% =
6. 6.300 decreased by 8% =
7. 7.760 decreased by 25% =
8. 8.365 increased by 60% =
9. 9.640 increased by 35% =
10. 10.408 decreased by 25% =
11. 11.88 increased by 25% =
12. 12.175 increased by 40% =
13. 13.300 increased by 12% =
14. 14.156 increased by 25% =
15. 15.300 increased by 15% =
16. 16.650 increased by 8% =
17. 17.250 increased by 12% =
18. 18.220 decreased by 40% =
19. 19.300 decreased by 5% =
20. 20.585 increased by 20% =
21. 21.760 increased by 75% =
22. 22.104 increased by 25% =
23. 23.444 increased by 75% =
24. 24.225 increased by 20% =
25. 25.240 decreased by 5% =
26. 26.750 decreased by 8% =
27. 27.220 increased by 20% =
28. 28.116 increased by 25% =
29. 29.104 increased by 75% =
30. 30.712 decreased by 25% =
31. 31.480 decreased by 5% =
32. 32.450 increased by 20% =
33. 33.400 decreased by 35% =
34. 34.244 decreased by 75% =
35. 35.630 decreased by 30% =
36. 36.736 increased by 25% =
37. 37.490 increased by 20% =
38. 38.64 decreased by 50% =
39. 39.140 increased by 5% =
40. 40.108 decreased by 25% =

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