Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 694 · 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. 1.260 decreased by 10% =
2. 2.55 increased by 60% =
3. 3.540 increased by 15% =
4. 4.700 decreased by 8% =
5. 5.410 decreased by 30% =
6. 6.372 decreased by 75% =
7. 7.700 increased by 12% =
8. 8.545 decreased by 20% =
9. 9.485 decreased by 60% =
10. 10.316 decreased by 25% =
11. 11.220 decreased by 30% =
12. 12.140 increased by 10% =
13. 13.482 increased by 50% =
14. 14.720 decreased by 5% =
15. 15.400 increased by 15% =
16. 16.130 increased by 40% =
17. 17.755 increased by 20% =
18. 18.660 decreased by 30% =
19. 19.550 increased by 50% =
20. 20.350 decreased by 8% =
21. 21.560 increased by 35% =
22. 22.380 increased by 25% =
23. 23.540 decreased by 35% =
24. 24.776 decreased by 75% =
25. 25.715 increased by 40% =
26. 26.575 increased by 8% =
27. 27.125 increased by 12% =
28. 28.150 increased by 30% =
29. 29.440 increased by 35% =
30. 30.260 decreased by 15% =
31. 31.285 decreased by 40% =
32. 32.100 decreased by 35% =
33. 33.180 increased by 35% =
34. 34.205 decreased by 40% =
35. 35.325 increased by 8% =
36. 36.370 decreased by 30% =
37. 37.100 decreased by 8% =
38. 38.632 increased by 25% =
39. 39.765 decreased by 40% =
40. 40.240 increased by 35% =

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