Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 556 · 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. 1.665 increased by 20% =
2. 2.675 decreased by 12% =
3. 3.210 increased by 20% =
4. 4.275 decreased by 12% =
5. 5.500 increased by 15% =
6. 6.510 decreased by 20% =
7. 7.146 decreased by 50% =
8. 8.340 increased by 35% =
9. 9.400 increased by 35% =
10. 10.800 increased by 40% =
11. 11.140 decreased by 5% =
12. 12.775 increased by 12% =
13. 13.360 increased by 10% =
14. 14.440 increased by 5% =
15. 15.740 increased by 60% =
16. 16.520 increased by 15% =
17. 17.380 increased by 5% =
18. 18.625 decreased by 12% =
19. 19.325 increased by 12% =
20. 20.190 decreased by 60% =
21. 21.560 decreased by 10% =
22. 22.530 increased by 10% =
23. 23.736 increased by 25% =
24. 24.800 increased by 75% =
25. 25.525 decreased by 12% =
26. 26.765 increased by 40% =
27. 27.210 increased by 50% =
28. 28.40 increased by 25% =
29. 29.512 increased by 75% =
30. 30.440 decreased by 15% =
31. 31.200 increased by 35% =
32. 32.250 increased by 8% =
33. 33.180 decreased by 35% =
34. 34.380 decreased by 5% =
35. 35.90 decreased by 60% =
36. 36.360 decreased by 5% =
37. 37.370 increased by 60% =
38. 38.725 decreased by 8% =
39. 39.180 decreased by 35% =
40. 40.92 increased by 75% =

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