Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 579 · 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. 1.750 decreased by 12% =
2. 2.155 decreased by 60% =
3. 3.435 increased by 20% =
4. 4.410 increased by 40% =
5. 5.100 decreased by 35% =
6. 6.608 increased by 25% =
7. 7.200 decreased by 10% =
8. 8.576 decreased by 25% =
9. 9.232 decreased by 75% =
10. 10.670 increased by 50% =
11. 11.584 decreased by 75% =
12. 12.556 increased by 75% =
13. 13.100 increased by 8% =
14. 14.650 decreased by 10% =
15. 15.450 decreased by 20% =
16. 16.175 increased by 8% =
17. 17.225 increased by 8% =
18. 18.140 increased by 30% =
19. 19.460 decreased by 20% =
20. 20.710 decreased by 20% =
21. 21.60 decreased by 20% =
22. 22.576 decreased by 50% =
23. 23.692 decreased by 50% =
24. 24.255 decreased by 60% =
25. 25.420 decreased by 15% =
26. 26.352 decreased by 25% =
27. 27.540 decreased by 75% =
28. 28.550 increased by 12% =
29. 29.688 increased by 75% =
30. 30.230 increased by 10% =
31. 31.700 increased by 10% =
32. 32.790 decreased by 30% =
33. 33.475 increased by 8% =
34. 34.585 decreased by 40% =
35. 35.420 decreased by 30% =
36. 36.380 increased by 15% =
37. 37.725 increased by 12% =
38. 38.780 increased by 10% =
39. 39.150 increased by 20% =
40. 40.720 increased by 5% =

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