Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 116 · 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. 1.272 decreased by 25% =
2. 2.200 increased by 12% =
3. 3.40 decreased by 15% =
4. 4.475 decreased by 60% =
5. 5.170 increased by 10% =
6. 6.390 increased by 10% =
7. 7.520 increased by 60% =
8. 8.732 increased by 75% =
9. 9.220 decreased by 20% =
10. 10.200 increased by 5% =
11. 11.220 increased by 5% =
12. 12.332 increased by 75% =
13. 13.560 decreased by 5% =
14. 14.120 increased by 20% =
15. 15.380 increased by 5% =
16. 16.320 increased by 35% =
17. 17.485 increased by 20% =
18. 18.300 increased by 35% =
19. 19.640 increased by 35% =
20. 20.85 increased by 20% =
21. 21.200 decreased by 5% =
22. 22.100 increased by 8% =
23. 23.125 increased by 12% =
24. 24.174 decreased by 50% =
25. 25.340 decreased by 10% =
26. 26.788 increased by 25% =
27. 27.720 increased by 60% =
28. 28.165 decreased by 60% =
29. 29.450 increased by 10% =
30. 30.120 increased by 60% =
31. 31.490 increased by 60% =
32. 32.80 increased by 15% =
33. 33.750 increased by 20% =
34. 34.475 increased by 20% =
35. 35.724 increased by 75% =
36. 36.215 increased by 60% =
37. 37.110 increased by 10% =
38. 38.326 increased by 50% =
39. 39.195 increased by 20% =
40. 40.92 increased by 75% =

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