Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 677 · 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. 1.60 increased by 30% =
2. 2.80 increased by 5% =
3. 3.715 decreased by 40% =
4. 4.220 decreased by 35% =
5. 5.500 decreased by 35% =
6. 6.800 decreased by 25% =
7. 7.80 decreased by 15% =
8. 8.580 decreased by 5% =
9. 9.650 decreased by 30% =
10. 10.500 increased by 5% =
11. 11.408 increased by 50% =
12. 12.240 increased by 15% =
13. 13.370 increased by 10% =
14. 14.260 increased by 15% =
15. 15.325 decreased by 12% =
16. 16.210 decreased by 30% =
17. 17.650 decreased by 12% =
18. 18.470 decreased by 50% =
19. 19.360 decreased by 5% =
20. 20.100 decreased by 15% =
21. 21.425 decreased by 12% =
22. 22.145 increased by 40% =
23. 23.730 decreased by 30% =
24. 24.400 increased by 5% =
25. 25.256 increased by 25% =
26. 26.520 increased by 15% =
27. 27.284 increased by 25% =
28. 28.100 increased by 10% =
29. 29.370 increased by 50% =
30. 30.154 decreased by 50% =
31. 31.250 increased by 12% =
32. 32.540 increased by 35% =
33. 33.380 increased by 15% =
34. 34.590 increased by 30% =
35. 35.504 decreased by 25% =
36. 36.724 decreased by 25% =
37. 37.300 increased by 35% =
38. 38.172 increased by 25% =
39. 39.220 increased by 15% =
40. 40.170 increased by 30% =

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