Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 428 · 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. 1.575 increased by 8% =
2. 2.295 decreased by 40% =
3. 3.315 decreased by 20% =
4. 4.700 increased by 10% =
5. 5.260 increased by 25% =
6. 6.180 increased by 10% =
7. 7.150 decreased by 40% =
8. 8.140 decreased by 5% =
9. 9.720 increased by 5% =
10. 10.100 decreased by 15% =
11. 11.388 increased by 75% =
12. 12.675 increased by 20% =
13. 13.500 decreased by 15% =
14. 14.315 increased by 20% =
15. 15.100 increased by 12% =
16. 16.724 decreased by 25% =
17. 17.360 increased by 20% =
18. 18.200 decreased by 75% =
19. 19.160 decreased by 15% =
20. 20.504 decreased by 25% =
21. 21.140 decreased by 5% =
22. 22.475 decreased by 12% =
23. 23.520 decreased by 10% =
24. 24.220 increased by 35% =
25. 25.500 increased by 8% =
26. 26.345 decreased by 20% =
27. 27.200 decreased by 12% =
28. 28.520 decreased by 35% =
29. 29.416 decreased by 75% =
30. 30.520 decreased by 30% =
31. 31.160 increased by 15% =
32. 32.316 decreased by 50% =
33. 33.100 increased by 12% =
34. 34.175 increased by 40% =
35. 35.625 increased by 12% =
36. 36.328 decreased by 75% =
37. 37.680 decreased by 35% =
38. 38.300 increased by 75% =
39. 39.540 increased by 5% =
40. 40.445 increased by 20% =

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