Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 663 · 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. 1.100 decreased by 12% =
2. 2.260 decreased by 10% =
3. 3.380 increased by 35% =
4. 4.490 decreased by 20% =
5. 5.245 increased by 60% =
6. 6.250 decreased by 10% =
7. 7.430 increased by 30% =
8. 8.180 increased by 60% =
9. 9.735 decreased by 20% =
10. 10.800 increased by 35% =
11. 11.800 decreased by 40% =
12. 12.790 increased by 40% =
13. 13.372 decreased by 25% =
14. 14.550 increased by 12% =
15. 15.750 increased by 12% =
16. 16.284 decreased by 25% =
17. 17.320 increased by 40% =
18. 18.190 decreased by 20% =
19. 19.404 increased by 50% =
20. 20.732 increased by 25% =
21. 21.420 increased by 15% =
22. 22.680 decreased by 35% =
23. 23.64 decreased by 25% =
24. 24.605 increased by 60% =
25. 25.100 increased by 12% =
26. 26.225 increased by 12% =
27. 27.340 decreased by 35% =
28. 28.360 decreased by 50% =
29. 29.552 decreased by 25% =
30. 30.230 decreased by 60% =
31. 31.220 decreased by 5% =
32. 32.300 increased by 8% =
33. 33.460 increased by 35% =
34. 34.200 decreased by 15% =
35. 35.210 increased by 60% =
36. 36.730 increased by 60% =
37. 37.200 decreased by 5% =
38. 38.150 increased by 12% =
39. 39.648 increased by 50% =
40. 40.160 increased by 30% =

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