Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 678 · 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. 1.620 increased by 5% =
2. 2.220 increased by 15% =
3. 3.225 increased by 12% =
4. 4.550 increased by 30% =
5. 5.800 increased by 35% =
6. 6.350 increased by 8% =
7. 7.80 decreased by 20% =
8. 8.770 decreased by 10% =
9. 9.330 decreased by 60% =
10. 10.120 increased by 35% =
11. 11.504 increased by 25% =
12. 12.475 decreased by 8% =
13. 13.492 increased by 25% =
14. 14.105 decreased by 40% =
15. 15.434 increased by 50% =
16. 16.125 increased by 12% =
17. 17.114 increased by 50% =
18. 18.632 decreased by 75% =
19. 19.728 increased by 50% =
20. 20.60 decreased by 5% =
21. 21.200 increased by 8% =
22. 22.650 decreased by 10% =
23. 23.680 decreased by 15% =
24. 24.40 increased by 75% =
25. 25.60 decreased by 75% =
26. 26.450 increased by 8% =
27. 27.800 decreased by 5% =
28. 28.585 decreased by 20% =
29. 29.625 increased by 8% =
30. 30.320 increased by 15% =
31. 31.525 increased by 8% =
32. 32.240 decreased by 20% =
33. 33.225 increased by 8% =
34. 34.128 increased by 75% =
35. 35.736 increased by 75% =
36. 36.695 increased by 40% =
37. 37.680 increased by 5% =
38. 38.140 increased by 75% =
39. 39.80 decreased by 35% =
40. 40.260 increased by 15% =

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