Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 460 · 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. 1.75 decreased by 12% =
2. 2.512 decreased by 25% =
3. 3.180 decreased by 10% =
4. 4.80 decreased by 30% =
5. 5.180 increased by 75% =
6. 6.180 decreased by 15% =
7. 7.100 increased by 12% =
8. 8.125 decreased by 8% =
9. 9.245 increased by 40% =
10. 10.734 increased by 50% =
11. 11.200 increased by 15% =
12. 12.800 decreased by 8% =
13. 13.246 increased by 50% =
14. 14.580 increased by 5% =
15. 15.675 decreased by 12% =
16. 16.620 increased by 5% =
17. 17.625 decreased by 8% =
18. 18.525 increased by 60% =
19. 19.295 decreased by 60% =
20. 20.110 increased by 10% =
21. 21.570 increased by 50% =
22. 22.100 decreased by 12% =
23. 23.152 increased by 50% =
24. 24.225 decreased by 8% =
25. 25.406 decreased by 50% =
26. 26.140 decreased by 75% =
27. 27.230 increased by 40% =
28. 28.75 increased by 8% =
29. 29.320 decreased by 40% =
30. 30.256 decreased by 75% =
31. 31.150 decreased by 60% =
32. 32.580 increased by 75% =
33. 33.540 increased by 30% =
34. 34.320 increased by 5% =
35. 35.70 decreased by 30% =
36. 36.225 decreased by 12% =
37. 37.545 decreased by 40% =
38. 38.770 increased by 10% =
39. 39.450 increased by 8% =
40. 40.280 increased by 60% =

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