Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 938 · 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. 1.304 decreased by 50% =
2. 2.66 decreased by 50% =
3. 3.50 decreased by 12% =
4. 4.90 decreased by 10% =
5. 5.695 increased by 20% =
6. 6.300 increased by 8% =
7. 7.265 decreased by 60% =
8. 8.80 decreased by 15% =
9. 9.228 increased by 25% =
10. 10.440 increased by 30% =
11. 11.48 increased by 75% =
12. 12.50 increased by 8% =
13. 13.630 increased by 60% =
14. 14.785 decreased by 20% =
15. 15.238 increased by 50% =
16. 16.530 increased by 40% =
17. 17.775 decreased by 12% =
18. 18.610 increased by 10% =
19. 19.640 decreased by 15% =
20. 20.440 decreased by 30% =
21. 21.470 decreased by 10% =
22. 22.660 increased by 30% =
23. 23.390 decreased by 40% =
24. 24.100 decreased by 15% =
25. 25.56 increased by 75% =
26. 26.760 increased by 20% =
27. 27.385 increased by 60% =
28. 28.232 increased by 25% =
29. 29.600 decreased by 60% =
30. 30.60 increased by 40% =
31. 31.276 increased by 25% =
32. 32.760 decreased by 35% =
33. 33.120 decreased by 20% =
34. 34.495 increased by 60% =
35. 35.470 increased by 40% =
36. 36.652 increased by 75% =
37. 37.150 decreased by 30% =
38. 38.530 increased by 60% =
39. 39.50 decreased by 30% =
40. 40.224 decreased by 75% =

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