Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 232 · 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. 1.300 increased by 12% =
2. 2.140 decreased by 15% =
3. 3.190 increased by 30% =
4. 4.138 decreased by 50% =
5. 5.482 decreased by 50% =
6. 6.404 increased by 75% =
7. 7.225 decreased by 8% =
8. 8.580 decreased by 20% =
9. 9.100 decreased by 8% =
10. 10.580 increased by 40% =
11. 11.385 increased by 40% =
12. 12.110 decreased by 30% =
13. 13.645 increased by 60% =
14. 14.300 increased by 8% =
15. 15.800 decreased by 8% =
16. 16.44 increased by 50% =
17. 17.546 decreased by 50% =
18. 18.675 decreased by 20% =
19. 19.440 increased by 40% =
20. 20.580 increased by 10% =
21. 21.590 increased by 20% =
22. 22.365 increased by 60% =
23. 23.632 decreased by 25% =
24. 24.560 decreased by 15% =
25. 25.770 decreased by 20% =
26. 26.625 decreased by 8% =
27. 27.350 increased by 30% =
28. 28.180 increased by 75% =
29. 29.280 decreased by 40% =
30. 30.632 increased by 25% =
31. 31.720 decreased by 35% =
32. 32.192 decreased by 25% =
33. 33.210 decreased by 30% =
34. 34.510 increased by 10% =
35. 35.40 decreased by 10% =
36. 36.660 decreased by 5% =
37. 37.240 increased by 10% =
38. 38.370 increased by 30% =
39. 39.565 increased by 20% =
40. 40.140 decreased by 5% =

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