Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 913 · 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. 1.605 increased by 20% =
2. 2.450 decreased by 10% =
3. 3.370 decreased by 40% =
4. 4.675 decreased by 12% =
5. 5.325 decreased by 40% =
6. 6.724 decreased by 25% =
7. 7.364 decreased by 25% =
8. 8.235 increased by 20% =
9. 9.96 increased by 25% =
10. 10.450 increased by 8% =
11. 11.775 decreased by 20% =
12. 12.700 increased by 5% =
13. 13.350 decreased by 10% =
14. 14.785 decreased by 20% =
15. 15.120 decreased by 30% =
16. 16.752 decreased by 25% =
17. 17.540 decreased by 15% =
18. 18.335 decreased by 40% =
19. 19.500 increased by 15% =
20. 20.560 decreased by 15% =
21. 21.610 increased by 10% =
22. 22.340 increased by 5% =
23. 23.564 increased by 50% =
24. 24.200 increased by 35% =
25. 25.660 increased by 75% =
26. 26.745 decreased by 20% =
27. 27.780 increased by 25% =
28. 28.400 decreased by 8% =
29. 29.730 decreased by 10% =
30. 30.735 decreased by 40% =
31. 31.370 increased by 20% =
32. 32.212 decreased by 25% =
33. 33.776 decreased by 25% =
34. 34.275 increased by 8% =
35. 35.625 decreased by 8% =
36. 36.280 increased by 5% =
37. 37.620 increased by 5% =
38. 38.60 decreased by 75% =
39. 39.525 decreased by 20% =
40. 40.336 decreased by 50% =

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