Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 438 · 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. 1.550 increased by 40% =
2. 2.180 increased by 30% =
3. 3.548 increased by 75% =
4. 4.355 increased by 60% =
5. 5.325 decreased by 12% =
6. 6.590 increased by 10% =
7. 7.428 increased by 75% =
8. 8.76 increased by 25% =
9. 9.400 increased by 25% =
10. 10.120 decreased by 15% =
11. 11.750 increased by 40% =
12. 12.520 increased by 15% =
13. 13.40 increased by 35% =
14. 14.660 increased by 30% =
15. 15.290 increased by 60% =
16. 16.80 decreased by 30% =
17. 17.475 decreased by 20% =
18. 18.540 decreased by 40% =
19. 19.460 increased by 60% =
20. 20.90 decreased by 10% =
21. 21.325 increased by 60% =
22. 22.680 decreased by 40% =
23. 23.240 decreased by 10% =
24. 24.780 increased by 15% =
25. 25.120 decreased by 10% =
26. 26.540 increased by 10% =
27. 27.170 decreased by 10% =
28. 28.720 decreased by 25% =
29. 29.660 increased by 35% =
30. 30.375 decreased by 12% =
31. 31.484 increased by 75% =
32. 32.185 increased by 60% =
33. 33.264 increased by 25% =
34. 34.200 decreased by 5% =
35. 35.180 decreased by 35% =
36. 36.640 increased by 75% =
37. 37.524 increased by 25% =
38. 38.40 decreased by 10% =
39. 39.264 increased by 75% =
40. 40.764 increased by 75% =

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