Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 244 · 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. 1.320 decreased by 15% =
2. 2.600 decreased by 12% =
3. 3.660 decreased by 35% =
4. 4.195 decreased by 20% =
5. 5.500 increased by 8% =
6. 6.460 increased by 15% =
7. 7.375 increased by 8% =
8. 8.470 decreased by 30% =
9. 9.135 decreased by 20% =
10. 10.60 increased by 5% =
11. 11.755 decreased by 20% =
12. 12.200 decreased by 5% =
13. 13.100 increased by 8% =
14. 14.75 increased by 8% =
15. 15.160 increased by 30% =
16. 16.600 decreased by 30% =
17. 17.544 decreased by 25% =
18. 18.520 increased by 15% =
19. 19.88 decreased by 75% =
20. 20.100 increased by 15% =
21. 21.225 increased by 60% =
22. 22.40 increased by 15% =
23. 23.725 increased by 12% =
24. 24.375 decreased by 20% =
25. 25.420 decreased by 30% =
26. 26.150 increased by 10% =
27. 27.116 increased by 75% =
28. 28.515 decreased by 60% =
29. 29.270 increased by 10% =
30. 30.425 decreased by 8% =
31. 31.340 decreased by 60% =
32. 32.140 increased by 10% =
33. 33.560 increased by 35% =
34. 34.675 increased by 12% =
35. 35.420 increased by 5% =
36. 36.496 increased by 25% =
37. 37.260 decreased by 30% =
38. 38.348 decreased by 25% =
39. 39.300 decreased by 5% =
40. 40.40 decreased by 5% =

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