Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 772 · 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. 1.684 decreased by 25% =
2. 2.420 increased by 20% =
3. 3.320 increased by 15% =
4. 4.660 increased by 35% =
5. 5.190 increased by 40% =
6. 6.480 decreased by 35% =
7. 7.460 increased by 75% =
8. 8.450 decreased by 8% =
9. 9.550 increased by 12% =
10. 10.440 decreased by 5% =
11. 11.150 increased by 8% =
12. 12.132 decreased by 25% =
13. 13.690 decreased by 20% =
14. 14.780 increased by 10% =
15. 15.740 decreased by 35% =
16. 16.120 decreased by 5% =
17. 17.705 increased by 40% =
18. 18.160 decreased by 5% =
19. 19.780 decreased by 40% =
20. 20.100 increased by 35% =
21. 21.175 decreased by 12% =
22. 22.200 increased by 10% =
23. 23.580 increased by 35% =
24. 24.788 increased by 75% =
25. 25.400 increased by 5% =
26. 26.105 increased by 40% =
27. 27.400 increased by 15% =
28. 28.140 decreased by 75% =
29. 29.690 decreased by 10% =
30. 30.400 increased by 12% =
31. 31.490 decreased by 30% =
32. 32.228 decreased by 25% =
33. 33.520 increased by 5% =
34. 34.580 decreased by 35% =
35. 35.400 increased by 10% =
36. 36.640 decreased by 35% =
37. 37.230 decreased by 60% =
38. 38.450 increased by 30% =
39. 39.188 increased by 75% =
40. 40.160 decreased by 10% =

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