Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 462 · 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. 1.625 decreased by 12% =
2. 2.344 decreased by 25% =
3. 3.725 increased by 8% =
4. 4.670 decreased by 50% =
5. 5.200 increased by 8% =
6. 6.350 decreased by 8% =
7. 7.240 increased by 30% =
8. 8.492 increased by 75% =
9. 9.220 increased by 5% =
10. 10.220 increased by 30% =
11. 11.100 decreased by 12% =
12. 12.100 decreased by 30% =
13. 13.348 decreased by 50% =
14. 14.350 decreased by 20% =
15. 15.770 increased by 30% =
16. 16.440 decreased by 10% =
17. 17.320 increased by 15% =
18. 18.275 decreased by 8% =
19. 19.800 increased by 15% =
20. 20.600 increased by 5% =
21. 21.680 decreased by 5% =
22. 22.504 increased by 75% =
23. 23.652 decreased by 75% =
24. 24.150 increased by 10% =
25. 25.720 increased by 30% =
26. 26.635 increased by 20% =
27. 27.208 increased by 75% =
28. 28.325 increased by 8% =
29. 29.350 increased by 12% =
30. 30.625 increased by 8% =
31. 31.240 increased by 15% =
32. 32.190 increased by 20% =
33. 33.800 decreased by 10% =
34. 34.580 decreased by 25% =
35. 35.80 decreased by 10% =
36. 36.640 decreased by 15% =
37. 37.750 increased by 8% =
38. 38.180 decreased by 5% =
39. 39.510 increased by 20% =
40. 40.475 increased by 12% =

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