Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 939 · 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. 1.600 increased by 12% =
2. 2.580 decreased by 15% =
3. 3.320 increased by 35% =
4. 4.170 increased by 10% =
5. 5.412 increased by 75% =
6. 6.700 decreased by 12% =
7. 7.86 decreased by 50% =
8. 8.530 decreased by 10% =
9. 9.275 increased by 8% =
10. 10.715 increased by 40% =
11. 11.600 decreased by 5% =
12. 12.630 increased by 10% =
13. 13.426 decreased by 50% =
14. 14.336 decreased by 25% =
15. 15.675 decreased by 8% =
16. 16.525 decreased by 8% =
17. 17.560 increased by 60% =
18. 18.300 decreased by 35% =
19. 19.750 decreased by 12% =
20. 20.304 decreased by 25% =
21. 21.220 increased by 5% =
22. 22.292 increased by 25% =
23. 23.460 decreased by 75% =
24. 24.55 increased by 40% =
25. 25.180 increased by 20% =
26. 26.450 increased by 12% =
27. 27.320 decreased by 50% =
28. 28.800 increased by 15% =
29. 29.670 decreased by 30% =
30. 30.300 increased by 15% =
31. 31.640 increased by 5% =
32. 32.660 increased by 15% =
33. 33.235 decreased by 60% =
34. 34.475 increased by 8% =
35. 35.105 decreased by 60% =
36. 36.340 decreased by 5% =
37. 37.75 increased by 8% =
38. 38.420 decreased by 5% =
39. 39.770 decreased by 10% =
40. 40.700 increased by 12% =

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