Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 221 · 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. 1.220 increased by 20% =
2. 2.775 decreased by 8% =
3. 3.368 decreased by 50% =
4. 4.56 increased by 75% =
5. 5.612 increased by 50% =
6. 6.180 decreased by 15% =
7. 7.700 increased by 15% =
8. 8.405 decreased by 40% =
9. 9.650 decreased by 10% =
10. 10.250 increased by 10% =
11. 11.540 decreased by 10% =
12. 12.220 decreased by 15% =
13. 13.752 decreased by 25% =
14. 14.440 increased by 15% =
15. 15.410 increased by 30% =
16. 16.715 increased by 20% =
17. 17.575 decreased by 8% =
18. 18.400 increased by 12% =
19. 19.740 increased by 30% =
20. 20.92 decreased by 75% =
21. 21.180 decreased by 15% =
22. 22.230 increased by 30% =
23. 23.290 increased by 20% =
24. 24.440 increased by 5% =
25. 25.580 increased by 15% =
26. 26.650 decreased by 12% =
27. 27.150 decreased by 8% =
28. 28.256 increased by 25% =
29. 29.172 increased by 50% =
30. 30.680 increased by 5% =
31. 31.75 increased by 12% =
32. 32.232 decreased by 25% =
33. 33.75 decreased by 8% =
34. 34.514 increased by 50% =
35. 35.660 increased by 5% =
36. 36.226 increased by 50% =
37. 37.690 increased by 30% =
38. 38.152 increased by 50% =
39. 39.420 increased by 5% =
40. 40.545 increased by 40% =

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