Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 940 · 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. 1.635 decreased by 60% =
2. 2.84 increased by 75% =
3. 3.275 increased by 12% =
4. 4.240 decreased by 20% =
5. 5.420 decreased by 50% =
6. 6.500 increased by 8% =
7. 7.260 decreased by 10% =
8. 8.480 increased by 35% =
9. 9.260 decreased by 10% =
10. 10.340 decreased by 5% =
11. 11.555 increased by 20% =
12. 12.520 decreased by 60% =
13. 13.275 increased by 20% =
14. 14.384 increased by 25% =
15. 15.412 decreased by 50% =
16. 16.660 decreased by 5% =
17. 17.368 decreased by 75% =
18. 18.175 increased by 12% =
19. 19.260 decreased by 5% =
20. 20.200 decreased by 35% =
21. 21.480 increased by 5% =
22. 22.115 increased by 60% =
23. 23.325 increased by 8% =
24. 24.75 decreased by 8% =
25. 25.220 increased by 10% =
26. 26.770 decreased by 20% =
27. 27.100 decreased by 5% =
28. 28.440 increased by 75% =
29. 29.375 increased by 12% =
30. 30.780 decreased by 35% =
31. 31.100 decreased by 12% =
32. 32.750 increased by 8% =
33. 33.740 increased by 5% =
34. 34.360 decreased by 20% =
35. 35.726 increased by 50% =
36. 36.520 increased by 5% =
37. 37.360 increased by 35% =
38. 38.650 increased by 10% =
39. 39.480 increased by 30% =
40. 40.540 increased by 20% =

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