Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 126 · 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. 1.165 decreased by 20% =
2. 2.480 decreased by 30% =
3. 3.200 decreased by 15% =
4. 4.240 decreased by 15% =
5. 5.80 increased by 75% =
6. 6.705 increased by 60% =
7. 7.140 decreased by 5% =
8. 8.730 decreased by 30% =
9. 9.60 decreased by 30% =
10. 10.796 increased by 25% =
11. 11.435 increased by 60% =
12. 12.415 increased by 60% =
13. 13.180 increased by 35% =
14. 14.765 decreased by 60% =
15. 15.595 increased by 60% =
16. 16.660 increased by 25% =
17. 17.760 increased by 10% =
18. 18.380 decreased by 20% =
19. 19.140 increased by 20% =
20. 20.600 increased by 12% =
21. 21.80 increased by 30% =
22. 22.364 increased by 75% =
23. 23.400 decreased by 8% =
24. 24.620 decreased by 35% =
25. 25.370 decreased by 30% =
26. 26.200 increased by 12% =
27. 27.170 increased by 20% =
28. 28.490 increased by 30% =
29. 29.350 increased by 12% =
30. 30.790 increased by 30% =
31. 31.40 increased by 20% =
32. 32.656 increased by 25% =
33. 33.625 increased by 8% =
34. 34.250 decreased by 20% =
35. 35.490 increased by 60% =
36. 36.256 decreased by 75% =
37. 37.696 decreased by 75% =
38. 38.125 increased by 12% =
39. 39.320 decreased by 35% =
40. 40.50 increased by 8% =

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