Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 140 · 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. 1.640 decreased by 40% =
2. 2.240 increased by 60% =
3. 3.180 increased by 25% =
4. 4.240 increased by 5% =
5. 5.250 decreased by 8% =
6. 6.300 decreased by 12% =
7. 7.104 decreased by 75% =
8. 8.380 increased by 5% =
9. 9.418 increased by 50% =
10. 10.680 decreased by 30% =
11. 11.110 increased by 20% =
12. 12.205 decreased by 20% =
13. 13.265 decreased by 20% =
14. 14.225 increased by 12% =
15. 15.340 decreased by 5% =
16. 16.230 decreased by 40% =
17. 17.655 decreased by 60% =
18. 18.650 decreased by 8% =
19. 19.600 decreased by 20% =
20. 20.540 decreased by 5% =
21. 21.575 decreased by 8% =
22. 22.560 decreased by 20% =
23. 23.400 increased by 30% =
24. 24.326 increased by 50% =
25. 25.380 decreased by 5% =
26. 26.80 increased by 20% =
27. 27.760 increased by 75% =
28. 28.54 decreased by 50% =
29. 29.624 increased by 25% =
30. 30.720 decreased by 30% =
31. 31.720 increased by 25% =
32. 32.324 decreased by 75% =
33. 33.108 decreased by 25% =
34. 34.725 increased by 20% =
35. 35.60 increased by 60% =
36. 36.550 decreased by 8% =
37. 37.495 increased by 20% =
38. 38.470 decreased by 20% =
39. 39.42 increased by 50% =
40. 40.480 decreased by 35% =

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