Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 523 · 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. 1.55 increased by 60% =
2. 2.100 decreased by 5% =
3. 3.640 increased by 25% =
4. 4.140 decreased by 5% =
5. 5.450 decreased by 12% =
6. 6.360 decreased by 15% =
7. 7.168 increased by 75% =
8. 8.740 increased by 15% =
9. 9.602 decreased by 50% =
10. 10.525 increased by 12% =
11. 11.760 decreased by 20% =
12. 12.52 increased by 75% =
13. 13.420 decreased by 10% =
14. 14.750 decreased by 10% =
15. 15.280 increased by 35% =
16. 16.640 decreased by 10% =
17. 17.140 decreased by 15% =
18. 18.672 increased by 75% =
19. 19.275 decreased by 8% =
20. 20.615 increased by 20% =
21. 21.210 increased by 50% =
22. 22.525 increased by 12% =
23. 23.116 increased by 50% =
24. 24.380 decreased by 15% =
25. 25.780 increased by 30% =
26. 26.132 increased by 50% =
27. 27.416 decreased by 50% =
28. 28.370 increased by 10% =
29. 29.708 decreased by 75% =
30. 30.560 increased by 10% =
31. 31.130 decreased by 60% =
32. 32.540 increased by 10% =
33. 33.650 increased by 30% =
34. 34.525 increased by 20% =
35. 35.150 increased by 12% =
36. 36.85 decreased by 60% =
37. 37.210 increased by 10% =
38. 38.560 decreased by 35% =
39. 39.320 decreased by 35% =
40. 40.260 decreased by 10% =

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