Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 881 · 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 increased by 15% =
2. 2.396 increased by 75% =
3. 3.120 increased by 75% =
4. 4.262 decreased by 50% =
5. 5.70 decreased by 10% =
6. 6.110 increased by 10% =
7. 7.320 increased by 20% =
8. 8.704 increased by 25% =
9. 9.260 decreased by 5% =
10. 10.796 decreased by 25% =
11. 11.790 increased by 20% =
12. 12.680 decreased by 15% =
13. 13.325 increased by 8% =
14. 14.350 increased by 10% =
15. 15.100 increased by 8% =
16. 16.420 decreased by 15% =
17. 17.756 decreased by 75% =
18. 18.270 increased by 60% =
19. 19.100 decreased by 35% =
20. 20.424 increased by 50% =
21. 21.560 decreased by 5% =
22. 22.460 decreased by 35% =
23. 23.560 increased by 5% =
24. 24.582 decreased by 50% =
25. 25.260 decreased by 15% =
26. 26.460 decreased by 20% =
27. 27.690 increased by 20% =
28. 28.120 decreased by 5% =
29. 29.440 increased by 75% =
30. 30.715 increased by 60% =
31. 31.216 increased by 75% =
32. 32.476 decreased by 75% =
33. 33.280 increased by 25% =
34. 34.760 decreased by 5% =
35. 35.730 decreased by 30% =
36. 36.650 increased by 8% =
37. 37.300 decreased by 12% =
38. 38.315 increased by 60% =
39. 39.340 increased by 10% =
40. 40.280 decreased by 5% =

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