Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 542 · 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. 1.510 increased by 10% =
2. 2.650 decreased by 12% =
3. 3.760 decreased by 35% =
4. 4.50 increased by 12% =
5. 5.320 increased by 40% =
6. 6.560 increased by 35% =
7. 7.225 increased by 8% =
8. 8.220 decreased by 5% =
9. 9.370 increased by 20% =
10. 10.360 increased by 15% =
11. 11.90 decreased by 40% =
12. 12.220 decreased by 25% =
13. 13.525 decreased by 8% =
14. 14.770 decreased by 30% =
15. 15.540 decreased by 20% =
16. 16.640 decreased by 35% =
17. 17.440 increased by 35% =
18. 18.135 decreased by 40% =
19. 19.206 increased by 50% =
20. 20.565 increased by 20% =
21. 21.440 increased by 15% =
22. 22.575 decreased by 8% =
23. 23.340 decreased by 15% =
24. 24.180 increased by 15% =
25. 25.380 increased by 15% =
26. 26.315 increased by 20% =
27. 27.405 increased by 40% =
28. 28.320 decreased by 35% =
29. 29.525 increased by 8% =
30. 30.48 decreased by 50% =
31. 31.140 decreased by 35% =
32. 32.560 increased by 10% =
33. 33.84 decreased by 25% =
34. 34.790 increased by 60% =
35. 35.768 decreased by 25% =
36. 36.680 decreased by 5% =
37. 37.70 decreased by 10% =
38. 38.528 decreased by 25% =
39. 39.40 increased by 15% =
40. 40.720 increased by 5% =

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