Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 781 · 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. 1.668 decreased by 50% =
2. 2.224 decreased by 75% =
3. 3.610 increased by 10% =
4. 4.648 decreased by 25% =
5. 5.280 decreased by 5% =
6. 6.660 increased by 15% =
7. 7.460 decreased by 10% =
8. 8.172 increased by 50% =
9. 9.725 decreased by 12% =
10. 10.720 decreased by 10% =
11. 11.590 increased by 30% =
12. 12.300 decreased by 8% =
13. 13.430 decreased by 10% =
14. 14.40 increased by 35% =
15. 15.600 increased by 10% =
16. 16.640 decreased by 5% =
17. 17.410 increased by 10% =
18. 18.600 increased by 12% =
19. 19.216 decreased by 75% =
20. 20.110 increased by 30% =
21. 21.272 increased by 25% =
22. 22.400 increased by 10% =
23. 23.260 decreased by 10% =
24. 24.350 increased by 8% =
25. 25.625 decreased by 8% =
26. 26.548 decreased by 25% =
27. 27.235 increased by 40% =
28. 28.40 increased by 30% =
29. 29.40 decreased by 5% =
30. 30.76 decreased by 25% =
31. 31.785 decreased by 20% =
32. 32.475 decreased by 12% =
33. 33.430 increased by 10% =
34. 34.230 decreased by 10% =
35. 35.625 decreased by 12% =
36. 36.740 decreased by 5% =
37. 37.176 decreased by 75% =
38. 38.450 increased by 10% =
39. 39.612 decreased by 25% =
40. 40.176 decreased by 75% =

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