Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 286 · 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 increased by 12% =
2. 2.120 decreased by 5% =
3. 3.320 increased by 5% =
4. 4.340 decreased by 25% =
5. 5.650 decreased by 40% =
6. 6.540 increased by 10% =
7. 7.292 decreased by 25% =
8. 8.360 increased by 5% =
9. 9.416 decreased by 75% =
10. 10.520 decreased by 10% =
11. 11.280 increased by 5% =
12. 12.364 decreased by 25% =
13. 13.520 decreased by 10% =
14. 14.540 decreased by 30% =
15. 15.240 decreased by 10% =
16. 16.400 decreased by 8% =
17. 17.680 decreased by 10% =
18. 18.775 decreased by 12% =
19. 19.396 decreased by 75% =
20. 20.448 increased by 50% =
21. 21.568 increased by 25% =
22. 22.630 increased by 40% =
23. 23.380 increased by 35% =
24. 24.450 increased by 40% =
25. 25.760 decreased by 20% =
26. 26.100 increased by 8% =
27. 27.70 increased by 60% =
28. 28.370 increased by 20% =
29. 29.385 decreased by 20% =
30. 30.680 decreased by 5% =
31. 31.780 increased by 5% =
32. 32.100 increased by 8% =
33. 33.280 increased by 60% =
34. 34.450 increased by 40% =
35. 35.750 increased by 60% =
36. 36.740 decreased by 35% =
37. 37.516 increased by 25% =
38. 38.470 increased by 40% =
39. 39.170 increased by 20% =
40. 40.40 decreased by 10% =

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