Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 369 · 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. 1.145 increased by 20% =
2. 2.320 decreased by 30% =
3. 3.290 increased by 10% =
4. 4.425 decreased by 8% =
5. 5.580 decreased by 5% =
6. 6.760 increased by 15% =
7. 7.325 decreased by 12% =
8. 8.360 increased by 40% =
9. 9.200 increased by 8% =
10. 10.790 increased by 10% =
11. 11.620 decreased by 35% =
12. 12.60 decreased by 35% =
13. 13.788 decreased by 25% =
14. 14.165 increased by 60% =
15. 15.225 increased by 12% =
16. 16.88 decreased by 25% =
17. 17.120 increased by 10% =
18. 18.100 increased by 12% =
19. 19.520 decreased by 60% =
20. 20.190 decreased by 10% =
21. 21.670 increased by 20% =
22. 22.785 decreased by 60% =
23. 23.272 increased by 25% =
24. 24.798 increased by 50% =
25. 25.250 decreased by 30% =
26. 26.56 increased by 75% =
27. 27.550 increased by 12% =
28. 28.730 decreased by 20% =
29. 29.180 decreased by 35% =
30. 30.640 decreased by 15% =
31. 31.260 increased by 10% =
32. 32.130 decreased by 30% =
33. 33.75 increased by 20% =
34. 34.104 increased by 75% =
35. 35.40 increased by 40% =
36. 36.605 increased by 60% =
37. 37.420 increased by 5% =
38. 38.184 decreased by 75% =
39. 39.625 increased by 40% =
40. 40.244 decreased by 25% =

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