Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 132 · 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. 1.324 decreased by 25% =
2. 2.575 increased by 12% =
3. 3.780 increased by 15% =
4. 4.320 increased by 5% =
5. 5.375 increased by 8% =
6. 6.725 increased by 12% =
7. 7.630 increased by 10% =
8. 8.716 increased by 75% =
9. 9.612 decreased by 50% =
10. 10.420 decreased by 20% =
11. 11.784 decreased by 25% =
12. 12.440 increased by 5% =
13. 13.322 decreased by 50% =
14. 14.200 decreased by 35% =
15. 15.620 decreased by 15% =
16. 16.620 increased by 5% =
17. 17.580 increased by 15% =
18. 18.650 increased by 12% =
19. 19.260 decreased by 25% =
20. 20.525 decreased by 8% =
21. 21.75 increased by 12% =
22. 22.188 increased by 25% =
23. 23.285 decreased by 20% =
24. 24.325 decreased by 8% =
25. 25.610 increased by 60% =
26. 26.512 decreased by 25% =
27. 27.390 increased by 30% =
28. 28.328 decreased by 75% =
29. 29.270 increased by 40% =
30. 30.425 increased by 12% =
31. 31.400 increased by 15% =
32. 32.590 decreased by 30% =
33. 33.380 increased by 15% =
34. 34.40 decreased by 35% =
35. 35.480 increased by 30% =
36. 36.560 increased by 35% =
37. 37.40 increased by 5% =
38. 38.800 increased by 12% =
39. 39.784 decreased by 25% =
40. 40.400 increased by 15% =

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