Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 354 · 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. 1.640 increased by 15% =
2. 2.484 increased by 50% =
3. 3.480 increased by 50% =
4. 4.100 increased by 15% =
5. 5.85 decreased by 40% =
6. 6.365 increased by 40% =
7. 7.180 decreased by 30% =
8. 8.792 decreased by 75% =
9. 9.240 increased by 15% =
10. 10.250 increased by 8% =
11. 11.728 increased by 25% =
12. 12.460 decreased by 5% =
13. 13.60 decreased by 5% =
14. 14.445 increased by 20% =
15. 15.530 decreased by 10% =
16. 16.520 increased by 5% =
17. 17.565 decreased by 60% =
18. 18.475 decreased by 12% =
19. 19.425 increased by 8% =
20. 20.446 increased by 50% =
21. 21.475 increased by 20% =
22. 22.576 increased by 25% =
23. 23.575 increased by 8% =
24. 24.185 increased by 40% =
25. 25.660 decreased by 25% =
26. 26.604 decreased by 75% =
27. 27.575 decreased by 40% =
28. 28.304 increased by 25% =
29. 29.400 increased by 75% =
30. 30.225 decreased by 60% =
31. 31.210 decreased by 20% =
32. 32.558 increased by 50% =
33. 33.66 decreased by 50% =
34. 34.125 increased by 12% =
35. 35.640 decreased by 15% =
36. 36.260 increased by 5% =
37. 37.166 decreased by 50% =
38. 38.586 decreased by 50% =
39. 39.260 decreased by 20% =
40. 40.440 increased by 5% =

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