Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 790 · 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. 1.610 increased by 30% =
2. 2.525 decreased by 8% =
3. 3.316 increased by 50% =
4. 4.355 increased by 20% =
5. 5.625 increased by 12% =
6. 6.280 increased by 25% =
7. 7.675 increased by 8% =
8. 8.776 increased by 75% =
9. 9.160 increased by 50% =
10. 10.475 decreased by 8% =
11. 11.136 increased by 75% =
12. 12.295 decreased by 20% =
13. 13.260 decreased by 20% =
14. 14.260 decreased by 75% =
15. 15.120 increased by 40% =
16. 16.760 decreased by 10% =
17. 17.200 decreased by 35% =
18. 18.200 increased by 5% =
19. 19.40 increased by 75% =
20. 20.256 increased by 75% =
21. 21.60 increased by 15% =
22. 22.325 increased by 40% =
23. 23.60 increased by 30% =
24. 24.430 increased by 10% =
25. 25.635 increased by 20% =
26. 26.40 increased by 5% =
27. 27.525 increased by 20% =
28. 28.100 increased by 8% =
29. 29.270 decreased by 20% =
30. 30.800 decreased by 25% =
31. 31.120 increased by 5% =
32. 32.292 increased by 50% =
33. 33.800 decreased by 15% =
34. 34.630 decreased by 20% =
35. 35.340 decreased by 5% =
36. 36.800 decreased by 40% =
37. 37.660 increased by 30% =
38. 38.316 decreased by 75% =
39. 39.160 increased by 10% =
40. 40.775 decreased by 8% =

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