Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 406 · 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. 1.105 decreased by 60% =
2. 2.650 decreased by 40% =
3. 3.700 increased by 12% =
4. 4.640 increased by 10% =
5. 5.342 increased by 50% =
6. 6.385 decreased by 40% =
7. 7.450 increased by 12% =
8. 8.400 decreased by 12% =
9. 9.130 increased by 60% =
10. 10.275 decreased by 12% =
11. 11.120 decreased by 35% =
12. 12.600 decreased by 12% =
13. 13.145 decreased by 60% =
14. 14.164 increased by 25% =
15. 15.700 decreased by 35% =
16. 16.440 increased by 10% =
17. 17.696 decreased by 50% =
18. 18.620 decreased by 35% =
19. 19.300 decreased by 10% =
20. 20.325 decreased by 8% =
21. 21.526 decreased by 50% =
22. 22.402 increased by 50% =
23. 23.232 decreased by 25% =
24. 24.650 decreased by 30% =
25. 25.240 increased by 5% =
26. 26.675 decreased by 60% =
27. 27.60 decreased by 60% =
28. 28.256 increased by 75% =
29. 29.710 decreased by 60% =
30. 30.440 decreased by 35% =
31. 31.650 increased by 12% =
32. 32.190 increased by 10% =
33. 33.680 increased by 5% =
34. 34.546 increased by 50% =
35. 35.225 increased by 8% =
36. 36.640 increased by 5% =
37. 37.675 decreased by 20% =
38. 38.225 decreased by 8% =
39. 39.584 decreased by 25% =
40. 40.275 decreased by 8% =

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