Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 478 · 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. 1.318 increased by 50% =
2. 2.568 decreased by 25% =
3. 3.175 increased by 12% =
4. 4.570 increased by 10% =
5. 5.650 decreased by 10% =
6. 6.50 increased by 20% =
7. 7.718 decreased by 50% =
8. 8.140 increased by 5% =
9. 9.605 decreased by 20% =
10. 10.196 increased by 75% =
11. 11.240 increased by 50% =
12. 12.280 increased by 10% =
13. 13.470 increased by 40% =
14. 14.380 decreased by 15% =
15. 15.40 increased by 60% =
16. 16.160 increased by 60% =
17. 17.224 increased by 50% =
18. 18.228 decreased by 25% =
19. 19.500 increased by 5% =
20. 20.332 increased by 25% =
21. 21.160 decreased by 5% =
22. 22.792 decreased by 50% =
23. 23.555 increased by 60% =
24. 24.358 decreased by 50% =
25. 25.785 decreased by 40% =
26. 26.102 decreased by 50% =
27. 27.160 increased by 10% =
28. 28.400 increased by 10% =
29. 29.420 decreased by 25% =
30. 30.388 increased by 25% =
31. 31.340 decreased by 35% =
32. 32.400 decreased by 15% =
33. 33.580 increased by 75% =
34. 34.80 increased by 35% =
35. 35.586 decreased by 50% =
36. 36.300 decreased by 75% =
37. 37.180 decreased by 15% =
38. 38.490 decreased by 40% =
39. 39.372 increased by 75% =
40. 40.692 increased by 75% =

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