Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 245 · 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. 1.670 increased by 10% =
2. 2.320 decreased by 40% =
3. 3.510 increased by 40% =
4. 4.625 increased by 8% =
5. 5.200 increased by 8% =
6. 6.165 increased by 20% =
7. 7.360 decreased by 15% =
8. 8.90 increased by 60% =
9. 9.100 decreased by 40% =
10. 10.80 decreased by 35% =
11. 11.460 increased by 75% =
12. 12.640 increased by 5% =
13. 13.600 increased by 15% =
14. 14.565 decreased by 20% =
15. 15.50 decreased by 60% =
16. 16.640 decreased by 5% =
17. 17.570 increased by 40% =
18. 18.325 decreased by 12% =
19. 19.580 decreased by 40% =
20. 20.790 increased by 30% =
21. 21.100 decreased by 8% =
22. 22.770 increased by 10% =
23. 23.630 decreased by 30% =
24. 24.730 increased by 30% =
25. 25.755 decreased by 40% =
26. 26.400 increased by 8% =
27. 27.60 decreased by 35% =
28. 28.124 decreased by 25% =
29. 29.96 decreased by 75% =
30. 30.625 decreased by 60% =
31. 31.500 increased by 35% =
32. 32.300 decreased by 12% =
33. 33.332 increased by 75% =
34. 34.600 increased by 12% =
35. 35.520 increased by 20% =
36. 36.695 decreased by 40% =
37. 37.560 decreased by 5% =
38. 38.575 increased by 8% =
39. 39.510 decreased by 60% =
40. 40.56 increased by 50% =

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