Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 113 · 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. 1.175 decreased by 60% =
2. 2.340 decreased by 15% =
3. 3.200 decreased by 12% =
4. 4.125 increased by 8% =
5. 5.260 decreased by 60% =
6. 6.420 increased by 5% =
7. 7.400 decreased by 12% =
8. 8.385 increased by 60% =
9. 9.720 increased by 35% =
10. 10.580 increased by 10% =
11. 11.590 increased by 20% =
12. 12.515 decreased by 40% =
13. 13.80 decreased by 35% =
14. 14.240 increased by 5% =
15. 15.668 increased by 75% =
16. 16.120 increased by 5% =
17. 17.180 increased by 5% =
18. 18.725 increased by 12% =
19. 19.660 decreased by 35% =
20. 20.564 increased by 25% =
21. 21.685 decreased by 60% =
22. 22.640 increased by 15% =
23. 23.380 decreased by 30% =
24. 24.120 decreased by 35% =
25. 25.502 increased by 50% =
26. 26.425 increased by 8% =
27. 27.260 increased by 15% =
28. 28.145 decreased by 20% =
29. 29.140 decreased by 5% =
30. 30.280 increased by 15% =
31. 31.70 increased by 10% =
32. 32.640 increased by 60% =
33. 33.65 decreased by 40% =
34. 34.375 decreased by 12% =
35. 35.108 increased by 75% =
36. 36.140 decreased by 40% =
37. 37.244 increased by 75% =
38. 38.220 decreased by 35% =
39. 39.525 increased by 12% =
40. 40.210 decreased by 20% =

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