Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 590 · 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. 1.580 increased by 25% =
2. 2.525 increased by 40% =
3. 3.140 decreased by 15% =
4. 4.325 decreased by 20% =
5. 5.200 decreased by 8% =
6. 6.180 decreased by 5% =
7. 7.75 increased by 40% =
8. 8.740 increased by 10% =
9. 9.640 decreased by 30% =
10. 10.430 decreased by 20% =
11. 11.588 increased by 25% =
12. 12.668 increased by 50% =
13. 13.95 decreased by 40% =
14. 14.72 increased by 25% =
15. 15.460 decreased by 5% =
16. 16.384 increased by 50% =
17. 17.575 decreased by 20% =
18. 18.432 increased by 75% =
19. 19.652 decreased by 25% =
20. 20.230 increased by 10% =
21. 21.450 decreased by 12% =
22. 22.480 increased by 10% =
23. 23.320 increased by 35% =
24. 24.260 decreased by 5% =
25. 25.175 decreased by 8% =
26. 26.560 increased by 35% =
27. 27.655 increased by 20% =
28. 28.175 increased by 8% =
29. 29.600 increased by 10% =
30. 30.55 increased by 20% =
31. 31.350 increased by 40% =
32. 32.350 increased by 8% =
33. 33.440 decreased by 10% =
34. 34.450 increased by 50% =
35. 35.500 increased by 8% =
36. 36.345 increased by 40% =
37. 37.92 increased by 50% =
38. 38.625 increased by 12% =
39. 39.540 decreased by 35% =
40. 40.510 increased by 40% =

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