Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 413 · 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. 1.225 increased by 12% =
2. 2.440 increased by 35% =
3. 3.380 increased by 30% =
4. 4.325 decreased by 12% =
5. 5.600 decreased by 8% =
6. 6.546 decreased by 50% =
7. 7.80 increased by 10% =
8. 8.750 increased by 10% =
9. 9.584 increased by 25% =
10. 10.196 increased by 25% =
11. 11.200 decreased by 35% =
12. 12.50 increased by 12% =
13. 13.380 decreased by 35% =
14. 14.80 decreased by 15% =
15. 15.585 decreased by 40% =
16. 16.320 increased by 75% =
17. 17.220 increased by 25% =
18. 18.668 decreased by 75% =
19. 19.800 decreased by 15% =
20. 20.496 decreased by 75% =
21. 21.450 increased by 60% =
22. 22.50 decreased by 12% =
23. 23.385 increased by 60% =
24. 24.530 increased by 10% =
25. 25.720 decreased by 10% =
26. 26.140 decreased by 15% =
27. 27.120 increased by 35% =
28. 28.740 increased by 25% =
29. 29.625 decreased by 12% =
30. 30.70 decreased by 40% =
31. 31.646 increased by 50% =
32. 32.455 increased by 20% =
33. 33.520 decreased by 35% =
34. 34.250 increased by 12% =
35. 35.520 increased by 15% =
36. 36.528 increased by 75% =
37. 37.760 increased by 5% =
38. 38.720 increased by 5% =
39. 39.40 decreased by 20% =
40. 40.440 increased by 5% =

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