Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 667 · 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. 1.660 increased by 10% =
2. 2.650 increased by 10% =
3. 3.315 increased by 60% =
4. 4.292 decreased by 75% =
5. 5.225 increased by 12% =
6. 6.175 increased by 8% =
7. 7.580 decreased by 5% =
8. 8.700 decreased by 15% =
9. 9.144 increased by 50% =
10. 10.250 decreased by 12% =
11. 11.625 decreased by 40% =
12. 12.440 decreased by 15% =
13. 13.575 decreased by 8% =
14. 14.75 increased by 12% =
15. 15.310 decreased by 30% =
16. 16.790 increased by 20% =
17. 17.484 increased by 25% =
18. 18.245 increased by 20% =
19. 19.450 increased by 8% =
20. 20.180 decreased by 20% =
21. 21.340 decreased by 20% =
22. 22.480 decreased by 75% =
23. 23.320 increased by 35% =
24. 24.168 decreased by 25% =
25. 25.110 decreased by 40% =
26. 26.40 increased by 5% =
27. 27.380 increased by 5% =
28. 28.75 decreased by 20% =
29. 29.304 decreased by 25% =
30. 30.352 increased by 50% =
31. 31.556 increased by 75% =
32. 32.210 increased by 10% =
33. 33.480 decreased by 35% =
34. 34.320 decreased by 60% =
35. 35.520 decreased by 35% =
36. 36.590 increased by 50% =
37. 37.44 increased by 50% =
38. 38.66 increased by 50% =
39. 39.75 decreased by 12% =
40. 40.700 increased by 12% =

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