Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 733 · 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. 1.120 decreased by 15% =
2. 2.110 increased by 30% =
3. 3.740 decreased by 50% =
4. 4.125 increased by 8% =
5. 5.560 increased by 30% =
6. 6.600 increased by 15% =
7. 7.534 increased by 50% =
8. 8.660 increased by 60% =
9. 9.472 decreased by 25% =
10. 10.180 decreased by 5% =
11. 11.500 decreased by 20% =
12. 12.350 increased by 10% =
13. 13.550 increased by 10% =
14. 14.336 decreased by 25% =
15. 15.520 decreased by 5% =
16. 16.350 increased by 8% =
17. 17.80 increased by 15% =
18. 18.800 decreased by 15% =
19. 19.365 decreased by 20% =
20. 20.670 decreased by 10% =
21. 21.464 decreased by 25% =
22. 22.800 increased by 15% =
23. 23.120 increased by 20% =
24. 24.100 increased by 8% =
25. 25.472 decreased by 25% =
26. 26.480 increased by 20% =
27. 27.390 decreased by 40% =
28. 28.435 increased by 20% =
29. 29.660 increased by 15% =
30. 30.640 increased by 5% =
31. 31.725 increased by 20% =
32. 32.775 increased by 40% =
33. 33.720 increased by 15% =
34. 34.200 increased by 8% =
35. 35.120 decreased by 35% =
36. 36.425 increased by 12% =
37. 37.320 decreased by 35% =
38. 38.672 increased by 75% =
39. 39.605 decreased by 60% =
40. 40.410 decreased by 60% =

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