Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 381 · 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. 1.204 increased by 75% =
2. 2.305 decreased by 20% =
3. 3.160 increased by 5% =
4. 4.735 decreased by 60% =
5. 5.760 increased by 20% =
6. 6.276 increased by 25% =
7. 7.630 increased by 30% =
8. 8.60 increased by 5% =
9. 9.265 decreased by 40% =
10. 10.80 decreased by 15% =
11. 11.375 decreased by 60% =
12. 12.160 increased by 10% =
13. 13.660 decreased by 15% =
14. 14.520 decreased by 5% =
15. 15.255 increased by 40% =
16. 16.405 decreased by 60% =
17. 17.65 decreased by 20% =
18. 18.320 increased by 30% =
19. 19.600 decreased by 5% =
20. 20.140 increased by 5% =
21. 21.680 decreased by 75% =
22. 22.140 decreased by 5% =
23. 23.400 decreased by 5% =
24. 24.650 increased by 12% =
25. 25.200 decreased by 5% =
26. 26.305 increased by 40% =
27. 27.80 increased by 35% =
28. 28.620 increased by 5% =
29. 29.225 increased by 8% =
30. 30.180 decreased by 25% =
31. 31.580 increased by 15% =
32. 32.608 increased by 75% =
33. 33.420 decreased by 75% =
34. 34.670 decreased by 10% =
35. 35.170 decreased by 10% =
36. 36.480 increased by 15% =
37. 37.105 decreased by 60% =
38. 38.120 increased by 30% =
39. 39.475 increased by 8% =
40. 40.390 decreased by 60% =

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