Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 390 · 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. 1.100 decreased by 5% =
2. 2.440 increased by 5% =
3. 3.625 decreased by 8% =
4. 4.675 increased by 12% =
5. 5.490 increased by 20% =
6. 6.605 decreased by 20% =
7. 7.744 increased by 75% =
8. 8.320 increased by 35% =
9. 9.215 increased by 40% =
10. 10.100 decreased by 8% =
11. 11.605 decreased by 60% =
12. 12.430 decreased by 10% =
13. 13.180 decreased by 35% =
14. 14.620 decreased by 10% =
15. 15.166 decreased by 50% =
16. 16.590 increased by 10% =
17. 17.785 increased by 40% =
18. 18.390 decreased by 30% =
19. 19.670 decreased by 30% =
20. 20.460 decreased by 15% =
21. 21.520 increased by 30% =
22. 22.240 increased by 60% =
23. 23.720 increased by 75% =
24. 24.80 increased by 40% =
25. 25.240 decreased by 15% =
26. 26.740 decreased by 35% =
27. 27.300 increased by 5% =
28. 28.750 increased by 8% =
29. 29.110 decreased by 40% =
30. 30.476 increased by 75% =
31. 31.196 increased by 75% =
32. 32.325 decreased by 12% =
33. 33.250 decreased by 20% =
34. 34.260 increased by 75% =
35. 35.670 decreased by 60% =
36. 36.120 decreased by 5% =
37. 37.675 decreased by 8% =
38. 38.440 increased by 5% =
39. 39.696 decreased by 75% =
40. 40.540 increased by 40% =

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