Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 313 · 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. 1.310 decreased by 30% =
2. 2.175 decreased by 12% =
3. 3.585 decreased by 20% =
4. 4.415 increased by 60% =
5. 5.260 increased by 35% =
6. 6.140 decreased by 60% =
7. 7.790 decreased by 60% =
8. 8.110 increased by 50% =
9. 9.290 decreased by 10% =
10. 10.240 increased by 15% =
11. 11.560 increased by 75% =
12. 12.740 decreased by 35% =
13. 13.670 decreased by 40% =
14. 14.416 decreased by 25% =
15. 15.180 decreased by 35% =
16. 16.375 increased by 12% =
17. 17.208 increased by 75% =
18. 18.660 increased by 10% =
19. 19.550 decreased by 20% =
20. 20.475 decreased by 8% =
21. 21.515 increased by 20% =
22. 22.720 increased by 15% =
23. 23.680 increased by 10% =
24. 24.240 decreased by 40% =
25. 25.536 decreased by 50% =
26. 26.514 decreased by 50% =
27. 27.100 decreased by 15% =
28. 28.556 decreased by 25% =
29. 29.765 increased by 20% =
30. 30.430 decreased by 30% =
31. 31.710 increased by 10% =
32. 32.325 decreased by 8% =
33. 33.664 increased by 75% =
34. 34.85 increased by 60% =
35. 35.625 increased by 12% =
36. 36.585 increased by 60% =
37. 37.260 increased by 35% =
38. 38.440 increased by 10% =
39. 39.594 increased by 50% =
40. 40.470 increased by 10% =

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