Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 425 · 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. 1.445 decreased by 20% =
2. 2.372 increased by 25% =
3. 3.650 increased by 12% =
4. 4.580 decreased by 10% =
5. 5.304 decreased by 50% =
6. 6.256 decreased by 50% =
7. 7.580 increased by 15% =
8. 8.645 increased by 40% =
9. 9.800 decreased by 15% =
10. 10.450 increased by 60% =
11. 11.100 decreased by 35% =
12. 12.270 increased by 10% =
13. 13.125 increased by 12% =
14. 14.652 decreased by 50% =
15. 15.700 decreased by 12% =
16. 16.610 increased by 60% =
17. 17.600 increased by 12% =
18. 18.160 decreased by 5% =
19. 19.475 increased by 8% =
20. 20.400 decreased by 35% =
21. 21.200 decreased by 40% =
22. 22.700 decreased by 5% =
23. 23.325 decreased by 12% =
24. 24.240 increased by 40% =
25. 25.660 decreased by 30% =
26. 26.330 increased by 30% =
27. 27.625 increased by 12% =
28. 28.304 decreased by 75% =
29. 29.760 increased by 40% =
30. 30.440 increased by 35% =
31. 31.780 increased by 35% =
32. 32.740 decreased by 10% =
33. 33.600 decreased by 5% =
34. 34.530 increased by 10% =
35. 35.710 increased by 30% =
36. 36.480 decreased by 75% =
37. 37.775 decreased by 8% =
38. 38.440 decreased by 15% =
39. 39.220 increased by 5% =
40. 40.725 increased by 8% =

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