Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 299 · 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. 1.354 increased by 50% =
2. 2.670 increased by 30% =
3. 3.440 increased by 75% =
4. 4.790 increased by 10% =
5. 5.600 decreased by 15% =
6. 6.390 decreased by 10% =
7. 7.300 decreased by 12% =
8. 8.200 decreased by 8% =
9. 9.320 increased by 30% =
10. 10.210 increased by 20% =
11. 11.415 decreased by 40% =
12. 12.710 decreased by 60% =
13. 13.456 decreased by 50% =
14. 14.520 increased by 35% =
15. 15.70 increased by 60% =
16. 16.760 decreased by 75% =
17. 17.615 increased by 40% =
18. 18.196 decreased by 75% =
19. 19.458 increased by 50% =
20. 20.385 increased by 20% =
21. 21.100 decreased by 8% =
22. 22.120 increased by 10% =
23. 23.60 increased by 10% =
24. 24.725 increased by 20% =
25. 25.260 decreased by 30% =
26. 26.400 decreased by 35% =
27. 27.760 increased by 5% =
28. 28.775 increased by 8% =
29. 29.60 decreased by 5% =
30. 30.150 decreased by 12% =
31. 31.725 decreased by 12% =
32. 32.210 decreased by 40% =
33. 33.440 decreased by 5% =
34. 34.340 decreased by 15% =
35. 35.765 increased by 60% =
36. 36.650 increased by 12% =
37. 37.150 increased by 12% =
38. 38.625 decreased by 8% =
39. 39.60 increased by 10% =
40. 40.584 increased by 75% =

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