Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 506 · 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. 1.308 increased by 75% =
2. 2.60 decreased by 30% =
3. 3.650 decreased by 60% =
4. 4.330 decreased by 50% =
5. 5.325 decreased by 12% =
6. 6.475 increased by 12% =
7. 7.360 decreased by 5% =
8. 8.750 decreased by 20% =
9. 9.360 decreased by 10% =
10. 10.775 decreased by 12% =
11. 11.280 increased by 5% =
12. 12.400 decreased by 5% =
13. 13.64 increased by 75% =
14. 14.290 increased by 10% =
15. 15.612 increased by 75% =
16. 16.580 increased by 15% =
17. 17.670 increased by 10% =
18. 18.232 increased by 50% =
19. 19.236 increased by 25% =
20. 20.255 decreased by 20% =
21. 21.300 increased by 40% =
22. 22.800 decreased by 15% =
23. 23.300 increased by 5% =
24. 24.280 decreased by 75% =
25. 25.260 decreased by 35% =
26. 26.180 increased by 15% =
27. 27.560 increased by 10% =
28. 28.710 decreased by 30% =
29. 29.200 increased by 20% =
30. 30.80 decreased by 5% =
31. 31.375 decreased by 12% =
32. 32.472 increased by 50% =
33. 33.760 increased by 30% =
34. 34.320 decreased by 15% =
35. 35.400 decreased by 15% =
36. 36.520 increased by 10% =
37. 37.660 increased by 5% =
38. 38.800 increased by 35% =
39. 39.176 increased by 25% =
40. 40.585 decreased by 60% =

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