Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 926 · 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. 1.440 decreased by 30% =
2. 2.150 increased by 50% =
3. 3.180 increased by 5% =
4. 4.350 decreased by 60% =
5. 5.475 decreased by 12% =
6. 6.205 decreased by 40% =
7. 7.730 increased by 10% =
8. 8.230 decreased by 40% =
9. 9.656 decreased by 50% =
10. 10.405 decreased by 40% =
11. 11.110 decreased by 10% =
12. 12.416 decreased by 75% =
13. 13.590 increased by 60% =
14. 14.625 decreased by 20% =
15. 15.125 increased by 8% =
16. 16.720 increased by 60% =
17. 17.200 increased by 8% =
18. 18.140 decreased by 30% =
19. 19.40 increased by 60% =
20. 20.610 decreased by 30% =
21. 21.780 decreased by 5% =
22. 22.240 increased by 5% =
23. 23.435 increased by 40% =
24. 24.380 decreased by 75% =
25. 25.550 decreased by 8% =
26. 26.225 increased by 12% =
27. 27.440 increased by 5% =
28. 28.724 increased by 75% =
29. 29.650 increased by 12% =
30. 30.718 increased by 50% =
31. 31.500 increased by 5% =
32. 32.160 decreased by 10% =
33. 33.70 increased by 30% =
34. 34.586 decreased by 50% =
35. 35.180 decreased by 5% =
36. 36.776 increased by 25% =
37. 37.790 increased by 40% =
38. 38.425 increased by 12% =
39. 39.458 increased by 50% =
40. 40.305 decreased by 40% =

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