Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 355 · 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. 1.675 decreased by 40% =
2. 2.618 increased by 50% =
3. 3.470 increased by 40% =
4. 4.625 decreased by 20% =
5. 5.48 increased by 75% =
6. 6.675 increased by 8% =
7. 7.350 increased by 12% =
8. 8.525 increased by 8% =
9. 9.504 decreased by 25% =
10. 10.520 decreased by 15% =
11. 11.580 decreased by 25% =
12. 12.790 decreased by 20% =
13. 13.712 increased by 75% =
14. 14.280 increased by 30% =
15. 15.155 decreased by 40% =
16. 16.200 increased by 8% =
17. 17.40 decreased by 5% =
18. 18.300 decreased by 30% =
19. 19.580 decreased by 20% =
20. 20.675 increased by 8% =
21. 21.615 increased by 20% =
22. 22.40 decreased by 40% =
23. 23.680 decreased by 40% =
24. 24.190 increased by 30% =
25. 25.568 increased by 75% =
26. 26.100 decreased by 50% =
27. 27.770 decreased by 30% =
28. 28.610 decreased by 30% =
29. 29.620 decreased by 15% =
30. 30.340 increased by 40% =
31. 31.556 decreased by 75% =
32. 32.300 increased by 5% =
33. 33.450 increased by 12% =
34. 34.372 increased by 25% =
35. 35.675 decreased by 40% =
36. 36.672 increased by 75% =
37. 37.510 decreased by 40% =
38. 38.790 increased by 30% =
39. 39.100 increased by 5% =
40. 40.670 decreased by 10% =

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