Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 23 · 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. 1.500 decreased by 25% =
2. 2.420 increased by 50% =
3. 3.580 decreased by 15% =
4. 4.510 increased by 30% =
5. 5.220 increased by 15% =
6. 6.450 decreased by 12% =
7. 7.375 decreased by 8% =
8. 8.475 increased by 60% =
9. 9.455 decreased by 40% =
10. 10.376 increased by 25% =
11. 11.520 decreased by 35% =
12. 12.80 increased by 5% =
13. 13.460 increased by 5% =
14. 14.220 decreased by 10% =
15. 15.475 increased by 60% =
16. 16.342 decreased by 50% =
17. 17.460 increased by 10% =
18. 18.490 decreased by 20% =
19. 19.540 increased by 15% =
20. 20.180 decreased by 10% =
21. 21.580 increased by 5% =
22. 22.665 increased by 20% =
23. 23.540 increased by 5% =
24. 24.144 increased by 75% =
25. 25.492 increased by 25% =
26. 26.370 decreased by 10% =
27. 27.300 increased by 8% =
28. 28.375 decreased by 8% =
29. 29.384 decreased by 25% =
30. 30.740 increased by 10% =
31. 31.280 decreased by 10% =
32. 32.760 decreased by 5% =
33. 33.696 decreased by 75% =
34. 34.244 decreased by 75% =
35. 35.140 increased by 60% =
36. 36.776 decreased by 25% =
37. 37.40 decreased by 30% =
38. 38.240 decreased by 10% =
39. 39.304 increased by 75% =
40. 40.195 decreased by 20% =

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