Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 304 · 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. 1.180 increased by 40% =
2. 2.380 increased by 15% =
3. 3.60 increased by 10% =
4. 4.75 decreased by 12% =
5. 5.460 decreased by 15% =
6. 6.40 increased by 5% =
7. 7.400 decreased by 12% =
8. 8.350 decreased by 30% =
9. 9.290 decreased by 10% =
10. 10.275 decreased by 12% =
11. 11.790 decreased by 30% =
12. 12.185 decreased by 40% =
13. 13.526 increased by 50% =
14. 14.400 decreased by 10% =
15. 15.800 decreased by 20% =
16. 16.780 increased by 15% =
17. 17.640 increased by 5% =
18. 18.720 increased by 10% =
19. 19.800 decreased by 15% =
20. 20.280 increased by 10% =
21. 21.140 decreased by 40% =
22. 22.585 increased by 20% =
23. 23.76 decreased by 50% =
24. 24.600 increased by 60% =
25. 25.214 increased by 50% =
26. 26.488 decreased by 75% =
27. 27.225 decreased by 40% =
28. 28.240 increased by 40% =
29. 29.270 increased by 20% =
30. 30.265 decreased by 40% =
31. 31.300 increased by 20% =
32. 32.590 decreased by 40% =
33. 33.380 decreased by 15% =
34. 34.708 increased by 75% =
35. 35.90 increased by 20% =
36. 36.750 decreased by 12% =
37. 37.94 increased by 50% =
38. 38.260 increased by 15% =
39. 39.600 increased by 12% =
40. 40.200 increased by 25% =

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