Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 82 · 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. 1.750 increased by 12% =
2. 2.320 increased by 15% =
3. 3.360 decreased by 10% =
4. 4.508 increased by 75% =
5. 5.540 decreased by 30% =
6. 6.570 decreased by 30% =
7. 7.165 decreased by 40% =
8. 8.105 decreased by 40% =
9. 9.625 decreased by 40% =
10. 10.475 increased by 20% =
11. 11.100 decreased by 8% =
12. 12.600 increased by 5% =
13. 13.190 increased by 60% =
14. 14.575 decreased by 8% =
15. 15.210 decreased by 20% =
16. 16.405 increased by 20% =
17. 17.275 increased by 40% =
18. 18.300 increased by 12% =
19. 19.525 decreased by 8% =
20. 20.740 decreased by 5% =
21. 21.580 decreased by 35% =
22. 22.380 decreased by 5% =
23. 23.520 decreased by 60% =
24. 24.160 decreased by 60% =
25. 25.660 increased by 5% =
26. 26.225 decreased by 12% =
27. 27.300 increased by 15% =
28. 28.520 increased by 5% =
29. 29.320 increased by 5% =
30. 30.148 decreased by 25% =
31. 31.460 increased by 10% =
32. 32.750 increased by 12% =
33. 33.460 increased by 5% =
34. 34.358 decreased by 50% =
35. 35.200 increased by 30% =
36. 36.488 decreased by 25% =
37. 37.560 increased by 5% =
38. 38.300 decreased by 75% =
39. 39.616 increased by 75% =
40. 40.536 increased by 50% =

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