Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 454 · 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. 1.752 increased by 25% =
2. 2.665 decreased by 20% =
3. 3.60 increased by 10% =
4. 4.44 increased by 75% =
5. 5.175 increased by 8% =
6. 6.320 decreased by 40% =
7. 7.160 increased by 10% =
8. 8.375 decreased by 12% =
9. 9.475 increased by 12% =
10. 10.540 increased by 60% =
11. 11.520 decreased by 20% =
12. 12.370 increased by 40% =
13. 13.380 decreased by 15% =
14. 14.180 increased by 15% =
15. 15.245 increased by 20% =
16. 16.105 increased by 60% =
17. 17.210 decreased by 40% =
18. 18.440 increased by 30% =
19. 19.485 increased by 40% =
20. 20.160 decreased by 5% =
21. 21.225 decreased by 8% =
22. 22.635 decreased by 20% =
23. 23.50 decreased by 8% =
24. 24.40 increased by 10% =
25. 25.690 increased by 60% =
26. 26.775 increased by 8% =
27. 27.500 decreased by 12% =
28. 28.450 increased by 8% =
29. 29.490 increased by 10% =
30. 30.725 decreased by 20% =
31. 31.450 increased by 12% =
32. 32.225 decreased by 12% =
33. 33.740 increased by 30% =
34. 34.100 decreased by 5% =
35. 35.480 increased by 40% =
36. 36.400 decreased by 20% =
37. 37.620 increased by 10% =
38. 38.250 increased by 8% =
39. 39.480 increased by 5% =
40. 40.342 increased by 50% =

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