Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 151 · 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. 1.330 decreased by 40% =
2. 2.728 increased by 75% =
3. 3.480 decreased by 15% =
4. 4.540 decreased by 75% =
5. 5.675 decreased by 12% =
6. 6.340 decreased by 35% =
7. 7.150 increased by 8% =
8. 8.190 increased by 10% =
9. 9.780 increased by 35% =
10. 10.250 decreased by 12% =
11. 11.244 increased by 25% =
12. 12.660 decreased by 35% =
13. 13.690 decreased by 30% =
14. 14.740 decreased by 5% =
15. 15.140 decreased by 5% =
16. 16.692 decreased by 75% =
17. 17.460 increased by 30% =
18. 18.720 increased by 15% =
19. 19.765 increased by 20% =
20. 20.360 increased by 60% =
21. 21.575 increased by 12% =
22. 22.210 decreased by 30% =
23. 23.620 increased by 15% =
24. 24.278 decreased by 50% =
25. 25.325 increased by 8% =
26. 26.70 decreased by 30% =
27. 27.270 increased by 40% =
28. 28.300 increased by 35% =
29. 29.750 decreased by 10% =
30. 30.640 decreased by 35% =
31. 31.432 decreased by 75% =
32. 32.645 decreased by 20% =
33. 33.640 decreased by 40% =
34. 34.740 increased by 10% =
35. 35.622 decreased by 50% =
36. 36.440 increased by 20% =
37. 37.560 increased by 10% =
38. 38.475 decreased by 60% =
39. 39.320 decreased by 5% =
40. 40.275 increased by 12% =

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