Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 859 · 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. 1.720 increased by 5% =
2. 2.730 decreased by 10% =
3. 3.240 increased by 35% =
4. 4.800 decreased by 8% =
5. 5.640 increased by 5% =
6. 6.380 increased by 75% =
7. 7.655 increased by 40% =
8. 8.370 increased by 30% =
9. 9.542 increased by 50% =
10. 10.775 increased by 12% =
11. 11.165 decreased by 20% =
12. 12.525 increased by 8% =
13. 13.575 increased by 8% =
14. 14.800 increased by 8% =
15. 15.420 increased by 30% =
16. 16.125 increased by 20% =
17. 17.80 increased by 30% =
18. 18.150 decreased by 10% =
19. 19.180 increased by 10% =
20. 20.696 decreased by 50% =
21. 21.552 decreased by 25% =
22. 22.776 decreased by 75% =
23. 23.520 increased by 30% =
24. 24.550 decreased by 12% =
25. 25.75 decreased by 8% =
26. 26.120 decreased by 25% =
27. 27.140 decreased by 40% =
28. 28.550 decreased by 8% =
29. 29.72 decreased by 25% =
30. 30.232 increased by 75% =
31. 31.65 increased by 40% =
32. 32.700 increased by 12% =
33. 33.500 increased by 5% =
34. 34.110 increased by 60% =
35. 35.108 decreased by 75% =
36. 36.675 decreased by 20% =
37. 37.150 decreased by 30% =
38. 38.298 increased by 50% =
39. 39.450 increased by 8% =
40. 40.770 decreased by 10% =

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