Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 723 · 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. 1.420 decreased by 15% =
2. 2.346 decreased by 50% =
3. 3.380 increased by 40% =
4. 4.368 increased by 50% =
5. 5.448 increased by 25% =
6. 6.100 increased by 15% =
7. 7.750 increased by 12% =
8. 8.60 decreased by 10% =
9. 9.370 decreased by 30% =
10. 10.68 decreased by 25% =
11. 11.540 increased by 10% =
12. 12.60 decreased by 5% =
13. 13.372 decreased by 25% =
14. 14.664 increased by 75% =
15. 15.40 decreased by 10% =
16. 16.125 decreased by 8% =
17. 17.550 decreased by 60% =
18. 18.700 decreased by 30% =
19. 19.785 decreased by 60% =
20. 20.100 increased by 5% =
21. 21.665 decreased by 20% =
22. 22.220 decreased by 5% =
23. 23.650 increased by 12% =
24. 24.185 increased by 40% =
25. 25.175 decreased by 40% =
26. 26.670 increased by 40% =
27. 27.495 increased by 20% =
28. 28.736 increased by 75% =
29. 29.300 increased by 8% =
30. 30.155 decreased by 60% =
31. 31.432 decreased by 75% =
32. 32.475 increased by 12% =
33. 33.660 decreased by 15% =
34. 34.175 increased by 8% =
35. 35.232 decreased by 25% =
36. 36.484 decreased by 25% =
37. 37.40 increased by 30% =
38. 38.380 increased by 35% =
39. 39.460 decreased by 40% =
40. 40.575 increased by 8% =

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