Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 900 · 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. 1.500 decreased by 8% =
2. 2.770 increased by 30% =
3. 3.120 decreased by 75% =
4. 4.196 increased by 50% =
5. 5.325 decreased by 8% =
6. 6.785 increased by 60% =
7. 7.70 decreased by 60% =
8. 8.345 decreased by 40% =
9. 9.125 increased by 12% =
10. 10.300 increased by 5% =
11. 11.560 increased by 40% =
12. 12.640 increased by 15% =
13. 13.200 increased by 15% =
14. 14.760 decreased by 5% =
15. 15.380 increased by 10% =
16. 16.225 increased by 40% =
17. 17.550 decreased by 12% =
18. 18.500 decreased by 35% =
19. 19.585 decreased by 40% =
20. 20.195 increased by 40% =
21. 21.430 decreased by 60% =
22. 22.670 decreased by 20% =
23. 23.520 increased by 35% =
24. 24.552 increased by 75% =
25. 25.520 increased by 75% =
26. 26.80 decreased by 35% =
27. 27.580 decreased by 60% =
28. 28.180 increased by 10% =
29. 29.420 decreased by 15% =
30. 30.156 decreased by 25% =
31. 31.798 increased by 50% =
32. 32.535 decreased by 20% =
33. 33.216 decreased by 25% =
34. 34.372 increased by 25% =
35. 35.370 decreased by 60% =
36. 36.690 decreased by 60% =
37. 37.590 decreased by 30% =
38. 38.260 increased by 35% =
39. 39.50 decreased by 10% =
40. 40.550 increased by 12% =

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