Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 317 · 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. 1.295 decreased by 20% =
2. 2.600 decreased by 5% =
3. 3.525 decreased by 60% =
4. 4.780 decreased by 35% =
5. 5.720 decreased by 35% =
6. 6.46 decreased by 50% =
7. 7.276 increased by 25% =
8. 8.670 increased by 10% =
9. 9.320 decreased by 30% =
10. 10.545 increased by 20% =
11. 11.752 decreased by 25% =
12. 12.304 decreased by 50% =
13. 13.560 decreased by 60% =
14. 14.165 increased by 60% =
15. 15.800 increased by 20% =
16. 16.55 increased by 40% =
17. 17.774 decreased by 50% =
18. 18.375 increased by 12% =
19. 19.354 decreased by 50% =
20. 20.612 decreased by 75% =
21. 21.680 decreased by 5% =
22. 22.400 increased by 8% =
23. 23.412 increased by 25% =
24. 24.575 increased by 20% =
25. 25.625 increased by 8% =
26. 26.320 decreased by 40% =
27. 27.258 decreased by 50% =
28. 28.320 decreased by 5% =
29. 29.440 decreased by 20% =
30. 30.265 decreased by 60% =
31. 31.325 increased by 8% =
32. 32.520 increased by 40% =
33. 33.670 increased by 40% =
34. 34.456 increased by 75% =
35. 35.380 increased by 20% =
36. 36.368 increased by 75% =
37. 37.40 increased by 20% =
38. 38.545 increased by 40% =
39. 39.140 decreased by 30% =
40. 40.256 decreased by 50% =

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