Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 348 · 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. 1.60 decreased by 5% =
2. 2.160 decreased by 15% =
3. 3.660 increased by 15% =
4. 4.466 decreased by 50% =
5. 5.130 increased by 10% =
6. 6.415 increased by 40% =
7. 7.175 decreased by 8% =
8. 8.200 increased by 15% =
9. 9.415 decreased by 60% =
10. 10.670 increased by 60% =
11. 11.340 increased by 5% =
12. 12.360 increased by 25% =
13. 13.190 increased by 10% =
14. 14.600 decreased by 20% =
15. 15.615 decreased by 20% =
16. 16.400 increased by 5% =
17. 17.180 increased by 15% =
18. 18.650 decreased by 30% =
19. 19.80 decreased by 35% =
20. 20.220 decreased by 10% =
21. 21.648 decreased by 25% =
22. 22.480 decreased by 5% =
23. 23.300 increased by 15% =
24. 24.550 decreased by 10% =
25. 25.320 increased by 25% =
26. 26.412 increased by 25% =
27. 27.440 decreased by 35% =
28. 28.490 decreased by 30% =
29. 29.240 increased by 30% =
30. 30.280 increased by 5% =
31. 31.178 decreased by 50% =
32. 32.320 decreased by 25% =
33. 33.220 increased by 30% =
34. 34.150 decreased by 12% =
35. 35.640 increased by 35% =
36. 36.160 increased by 5% =
37. 37.580 increased by 35% =
38. 38.500 decreased by 60% =
39. 39.605 increased by 60% =
40. 40.425 increased by 12% =

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