Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 414 · 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. 1.670 increased by 60% =
2. 2.120 increased by 20% =
3. 3.620 increased by 5% =
4. 4.300 increased by 40% =
5. 5.480 decreased by 10% =
6. 6.450 decreased by 60% =
7. 7.358 increased by 50% =
8. 8.620 decreased by 20% =
9. 9.715 increased by 20% =
10. 10.76 increased by 50% =
11. 11.712 increased by 25% =
12. 12.432 decreased by 50% =
13. 13.470 decreased by 10% =
14. 14.760 decreased by 15% =
15. 15.550 decreased by 20% =
16. 16.760 increased by 35% =
17. 17.220 decreased by 60% =
18. 18.410 decreased by 40% =
19. 19.790 decreased by 10% =
20. 20.456 decreased by 50% =
21. 21.400 increased by 35% =
22. 22.785 decreased by 40% =
23. 23.80 increased by 30% =
24. 24.160 decreased by 5% =
25. 25.120 decreased by 10% =
26. 26.215 increased by 20% =
27. 27.175 increased by 12% =
28. 28.330 decreased by 60% =
29. 29.185 decreased by 20% =
30. 30.315 increased by 60% =
31. 31.475 increased by 60% =
32. 32.160 increased by 10% =
33. 33.204 decreased by 75% =
34. 34.548 decreased by 25% =
35. 35.744 increased by 75% =
36. 36.630 increased by 30% =
37. 37.420 increased by 5% =
38. 38.172 increased by 75% =
39. 39.720 decreased by 35% =
40. 40.540 increased by 5% =

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