Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 207 · 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. 1.320 decreased by 10% =
2. 2.670 decreased by 30% =
3. 3.610 decreased by 10% =
4. 4.800 increased by 35% =
5. 5.364 increased by 25% =
6. 6.200 increased by 20% =
7. 7.415 increased by 20% =
8. 8.645 decreased by 20% =
9. 9.350 decreased by 12% =
10. 10.100 decreased by 10% =
11. 11.240 increased by 10% =
12. 12.660 decreased by 15% =
13. 13.75 increased by 8% =
14. 14.205 increased by 40% =
15. 15.180 increased by 20% =
16. 16.700 decreased by 60% =
17. 17.370 decreased by 30% =
18. 18.255 decreased by 60% =
19. 19.102 increased by 50% =
20. 20.515 increased by 60% =
21. 21.116 increased by 75% =
22. 22.130 increased by 30% =
23. 23.40 increased by 75% =
24. 24.540 decreased by 25% =
25. 25.330 increased by 30% =
26. 26.136 increased by 25% =
27. 27.750 increased by 10% =
28. 28.610 increased by 20% =
29. 29.520 increased by 15% =
30. 30.732 increased by 75% =
31. 31.410 decreased by 60% =
32. 32.190 decreased by 10% =
33. 33.700 increased by 10% =
34. 34.668 increased by 25% =
35. 35.752 decreased by 25% =
36. 36.276 increased by 50% =
37. 37.525 decreased by 60% =
38. 38.272 increased by 50% =
39. 39.460 decreased by 5% =
40. 40.475 increased by 20% =

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