Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 106 · 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. 1.422 decreased by 50% =
2. 2.525 decreased by 8% =
3. 3.525 increased by 12% =
4. 4.472 decreased by 50% =
5. 5.340 decreased by 75% =
6. 6.135 decreased by 60% =
7. 7.720 increased by 75% =
8. 8.800 increased by 75% =
9. 9.230 increased by 40% =
10. 10.100 increased by 15% =
11. 11.280 decreased by 10% =
12. 12.140 decreased by 15% =
13. 13.652 decreased by 25% =
14. 14.580 decreased by 15% =
15. 15.180 increased by 35% =
16. 16.472 increased by 25% =
17. 17.675 increased by 12% =
18. 18.420 increased by 5% =
19. 19.268 decreased by 75% =
20. 20.216 increased by 75% =
21. 21.40 decreased by 15% =
22. 22.125 decreased by 12% =
23. 23.620 decreased by 30% =
24. 24.664 increased by 75% =
25. 25.440 decreased by 10% =
26. 26.300 decreased by 12% =
27. 27.470 decreased by 20% =
28. 28.636 decreased by 25% =
29. 29.620 increased by 10% =
30. 30.735 increased by 60% =
31. 31.770 increased by 30% =
32. 32.60 increased by 5% =
33. 33.415 increased by 40% =
34. 34.180 decreased by 10% =
35. 35.225 increased by 12% =
36. 36.380 increased by 40% =
37. 37.120 increased by 10% =
38. 38.300 decreased by 8% =
39. 39.760 decreased by 5% =
40. 40.218 decreased by 50% =

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