Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 522 · 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. 1.45 decreased by 20% =
2. 2.270 increased by 50% =
3. 3.52 decreased by 25% =
4. 4.245 increased by 60% =
5. 5.280 decreased by 15% =
6. 6.175 decreased by 12% =
7. 7.520 increased by 30% =
8. 8.50 decreased by 10% =
9. 9.525 decreased by 8% =
10. 10.260 increased by 5% =
11. 11.320 increased by 5% =
12. 12.50 increased by 10% =
13. 13.800 decreased by 12% =
14. 14.625 decreased by 8% =
15. 15.780 decreased by 40% =
16. 16.720 decreased by 15% =
17. 17.100 decreased by 12% =
18. 18.272 increased by 25% =
19. 19.790 decreased by 30% =
20. 20.776 increased by 75% =
21. 21.200 decreased by 5% =
22. 22.380 decreased by 30% =
23. 23.732 increased by 25% =
24. 24.350 decreased by 20% =
25. 25.250 decreased by 8% =
26. 26.760 increased by 30% =
27. 27.580 increased by 10% =
28. 28.550 decreased by 8% =
29. 29.176 decreased by 50% =
30. 30.100 decreased by 20% =
31. 31.282 increased by 50% =
32. 32.796 decreased by 75% =
33. 33.652 increased by 75% =
34. 34.440 decreased by 40% =
35. 35.585 decreased by 40% =
36. 36.616 increased by 25% =
37. 37.210 increased by 20% =
38. 38.50 increased by 8% =
39. 39.120 decreased by 10% =
40. 40.472 increased by 75% =

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