Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 28 · 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. 1.465 increased by 60% =
2. 2.720 decreased by 15% =
3. 3.532 decreased by 25% =
4. 4.260 increased by 15% =
5. 5.400 increased by 30% =
6. 6.525 decreased by 60% =
7. 7.790 decreased by 20% =
8. 8.750 increased by 12% =
9. 9.640 increased by 15% =
10. 10.364 increased by 50% =
11. 11.310 increased by 40% =
12. 12.140 increased by 40% =
13. 13.160 increased by 35% =
14. 14.375 increased by 8% =
15. 15.160 decreased by 30% =
16. 16.120 increased by 35% =
17. 17.80 decreased by 60% =
18. 18.170 increased by 30% =
19. 19.40 decreased by 30% =
20. 20.210 increased by 30% =
21. 21.724 increased by 75% =
22. 22.800 decreased by 15% =
23. 23.100 decreased by 35% =
24. 24.400 decreased by 30% =
25. 25.710 increased by 60% =
26. 26.460 increased by 10% =
27. 27.744 increased by 25% =
28. 28.408 decreased by 25% =
29. 29.100 increased by 75% =
30. 30.280 increased by 15% =
31. 31.290 increased by 20% =
32. 32.75 decreased by 12% =
33. 33.168 decreased by 75% =
34. 34.250 increased by 30% =
35. 35.105 increased by 40% =
36. 36.415 decreased by 20% =
37. 37.120 increased by 15% =
38. 38.75 decreased by 12% =
39. 39.310 increased by 20% =
40. 40.660 decreased by 10% =

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