Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 984 · 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. 1.40 decreased by 10% =
2. 2.56 increased by 25% =
3. 3.755 decreased by 20% =
4. 4.206 increased by 50% =
5. 5.440 increased by 75% =
6. 6.220 decreased by 5% =
7. 7.40 increased by 5% =
8. 8.180 decreased by 20% =
9. 9.650 increased by 8% =
10. 10.70 decreased by 20% =
11. 11.755 decreased by 20% =
12. 12.500 increased by 8% =
13. 13.736 increased by 25% =
14. 14.450 increased by 12% =
15. 15.275 increased by 8% =
16. 16.44 decreased by 25% =
17. 17.268 increased by 50% =
18. 18.375 decreased by 12% =
19. 19.92 decreased by 75% =
20. 20.480 decreased by 5% =
21. 21.775 increased by 8% =
22. 22.75 increased by 12% =
23. 23.530 decreased by 10% =
24. 24.60 decreased by 30% =
25. 25.160 decreased by 15% =
26. 26.675 increased by 8% =
27. 27.168 increased by 25% =
28. 28.650 increased by 12% =
29. 29.260 increased by 30% =
30. 30.455 increased by 20% =
31. 31.122 decreased by 50% =
32. 32.390 decreased by 30% =
33. 33.160 increased by 10% =
34. 34.100 decreased by 12% =
35. 35.450 increased by 30% =
36. 36.112 increased by 75% =
37. 37.40 decreased by 15% =
38. 38.760 increased by 20% =
39. 39.230 decreased by 10% =
40. 40.80 increased by 75% =

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