Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 611 · 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. 1.560 decreased by 30% =
2. 2.598 decreased by 50% =
3. 3.565 decreased by 40% =
4. 4.200 increased by 8% =
5. 5.65 increased by 60% =
6. 6.250 decreased by 10% =
7. 7.444 decreased by 75% =
8. 8.220 decreased by 10% =
9. 9.180 decreased by 35% =
10. 10.544 increased by 75% =
11. 11.640 increased by 35% =
12. 12.800 decreased by 5% =
13. 13.168 increased by 75% =
14. 14.600 decreased by 8% =
15. 15.440 increased by 40% =
16. 16.70 decreased by 10% =
17. 17.710 decreased by 20% =
18. 18.365 decreased by 20% =
19. 19.475 decreased by 12% =
20. 20.675 increased by 20% =
21. 21.505 increased by 20% =
22. 22.140 decreased by 5% =
23. 23.80 increased by 75% =
24. 24.130 increased by 20% =
25. 25.720 decreased by 5% =
26. 26.240 decreased by 5% =
27. 27.120 increased by 5% =
28. 28.200 decreased by 5% =
29. 29.724 increased by 75% =
30. 30.180 decreased by 35% =
31. 31.300 increased by 8% =
32. 32.275 decreased by 60% =
33. 33.660 increased by 5% =
34. 34.450 decreased by 8% =
35. 35.560 increased by 60% =
36. 36.460 decreased by 25% =
37. 37.120 increased by 40% =
38. 38.492 increased by 75% =
39. 39.330 increased by 10% =
40. 40.285 decreased by 60% =

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