Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 489 · 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. 1.595 decreased by 40% =
2. 2.600 decreased by 40% =
3. 3.720 increased by 15% =
4. 4.125 increased by 8% =
5. 5.200 decreased by 12% =
6. 6.100 increased by 8% =
7. 7.580 decreased by 20% =
8. 8.672 increased by 75% =
9. 9.570 decreased by 20% =
10. 10.212 decreased by 25% =
11. 11.640 increased by 5% =
12. 12.775 decreased by 8% =
13. 13.640 increased by 5% =
14. 14.180 increased by 35% =
15. 15.420 decreased by 30% =
16. 16.380 decreased by 10% =
17. 17.790 increased by 10% =
18. 18.696 increased by 25% =
19. 19.525 decreased by 12% =
20. 20.610 decreased by 30% =
21. 21.175 increased by 12% =
22. 22.620 increased by 5% =
23. 23.125 decreased by 40% =
24. 24.140 decreased by 50% =
25. 25.210 increased by 60% =
26. 26.240 decreased by 15% =
27. 27.462 increased by 50% =
28. 28.300 decreased by 30% =
29. 29.420 decreased by 25% =
30. 30.750 increased by 12% =
31. 31.645 increased by 20% =
32. 32.360 increased by 35% =
33. 33.750 increased by 12% =
34. 34.780 increased by 60% =
35. 35.800 increased by 25% =
36. 36.590 increased by 10% =
37. 37.625 decreased by 8% =
38. 38.350 increased by 60% =
39. 39.220 decreased by 15% =
40. 40.710 increased by 40% =

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