Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 427 · 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. 1.625 increased by 60% =
2. 2.305 decreased by 60% =
3. 3.740 increased by 10% =
4. 4.725 increased by 12% =
5. 5.524 increased by 25% =
6. 6.390 increased by 60% =
7. 7.380 decreased by 10% =
8. 8.72 increased by 75% =
9. 9.88 increased by 75% =
10. 10.715 decreased by 20% =
11. 11.800 decreased by 12% =
12. 12.140 decreased by 35% =
13. 13.690 increased by 60% =
14. 14.320 increased by 75% =
15. 15.535 decreased by 40% =
16. 16.320 decreased by 5% =
17. 17.610 decreased by 40% =
18. 18.480 increased by 35% =
19. 19.120 decreased by 5% =
20. 20.600 increased by 10% =
21. 21.356 increased by 25% =
22. 22.500 decreased by 5% =
23. 23.520 decreased by 75% =
24. 24.425 increased by 8% =
25. 25.600 decreased by 35% =
26. 26.510 increased by 20% =
27. 27.615 decreased by 20% =
28. 28.760 decreased by 50% =
29. 29.760 increased by 15% =
30. 30.350 increased by 8% =
31. 31.180 increased by 15% =
32. 32.40 decreased by 5% =
33. 33.480 decreased by 35% =
34. 34.250 increased by 20% =
35. 35.580 increased by 5% =
36. 36.750 decreased by 12% =
37. 37.75 decreased by 8% =
38. 38.740 increased by 15% =
39. 39.425 decreased by 12% =
40. 40.316 decreased by 25% =

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