Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 71 · 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. 1.580 increased by 20% =
2. 2.630 decreased by 10% =
3. 3.624 increased by 75% =
4. 4.400 decreased by 8% =
5. 5.475 increased by 12% =
6. 6.580 decreased by 30% =
7. 7.760 decreased by 5% =
8. 8.80 increased by 35% =
9. 9.750 increased by 8% =
10. 10.284 decreased by 75% =
11. 11.150 increased by 30% =
12. 12.615 increased by 20% =
13. 13.425 decreased by 8% =
14. 14.620 increased by 35% =
15. 15.180 increased by 30% =
16. 16.50 increased by 12% =
17. 17.650 increased by 8% =
18. 18.50 decreased by 12% =
19. 19.120 increased by 20% =
20. 20.240 decreased by 20% =
21. 21.60 increased by 15% =
22. 22.100 increased by 12% =
23. 23.790 increased by 10% =
24. 24.790 decreased by 30% =
25. 25.240 decreased by 10% =
26. 26.315 decreased by 20% =
27. 27.400 decreased by 15% =
28. 28.200 increased by 15% =
29. 29.740 increased by 5% =
30. 30.625 decreased by 8% =
31. 31.680 decreased by 5% =
32. 32.430 increased by 60% =
33. 33.644 increased by 50% =
34. 34.720 decreased by 15% =
35. 35.330 decreased by 30% =
36. 36.336 decreased by 25% =
37. 37.145 decreased by 20% =
38. 38.260 increased by 5% =
39. 39.225 decreased by 60% =
40. 40.364 decreased by 75% =

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