Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 185 · 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. 1.704 decreased by 75% =
2. 2.685 increased by 20% =
3. 3.790 increased by 30% =
4. 4.436 decreased by 25% =
5. 5.130 increased by 40% =
6. 6.80 increased by 5% =
7. 7.440 decreased by 5% =
8. 8.660 increased by 15% =
9. 9.70 decreased by 20% =
10. 10.740 decreased by 15% =
11. 11.550 increased by 30% =
12. 12.660 decreased by 75% =
13. 13.50 increased by 10% =
14. 14.220 increased by 10% =
15. 15.560 increased by 60% =
16. 16.570 decreased by 10% =
17. 17.360 decreased by 20% =
18. 18.540 decreased by 5% =
19. 19.590 decreased by 50% =
20. 20.155 decreased by 40% =
21. 21.50 decreased by 10% =
22. 22.625 increased by 8% =
23. 23.230 increased by 10% =
24. 24.696 increased by 25% =
25. 25.220 increased by 15% =
26. 26.740 decreased by 10% =
27. 27.400 increased by 15% =
28. 28.485 decreased by 20% =
29. 29.560 decreased by 15% =
30. 30.170 decreased by 10% =
31. 31.490 decreased by 20% =
32. 32.430 decreased by 60% =
33. 33.752 decreased by 75% =
34. 34.760 decreased by 5% =
35. 35.228 increased by 75% =
36. 36.625 increased by 8% =
37. 37.125 decreased by 12% =
38. 38.325 increased by 8% =
39. 39.586 increased by 50% =
40. 40.350 increased by 12% =

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