Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 809 · 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 decreased by 12% =
2. 2.130 decreased by 30% =
3. 3.460 decreased by 40% =
4. 4.45 decreased by 60% =
5. 5.710 increased by 10% =
6. 6.645 increased by 40% =
7. 7.725 decreased by 12% =
8. 8.525 increased by 12% =
9. 9.590 decreased by 60% =
10. 10.725 decreased by 8% =
11. 11.775 decreased by 8% =
12. 12.640 increased by 35% =
13. 13.775 increased by 8% =
14. 14.300 decreased by 15% =
15. 15.140 increased by 15% =
16. 16.720 decreased by 5% =
17. 17.600 decreased by 35% =
18. 18.110 decreased by 10% =
19. 19.120 decreased by 10% =
20. 20.40 decreased by 35% =
21. 21.400 increased by 10% =
22. 22.680 increased by 35% =
23. 23.480 decreased by 15% =
24. 24.716 decreased by 75% =
25. 25.556 decreased by 25% =
26. 26.470 increased by 50% =
27. 27.200 increased by 5% =
28. 28.410 increased by 30% =
29. 29.320 increased by 35% =
30. 30.620 decreased by 40% =
31. 31.360 decreased by 50% =
32. 32.610 decreased by 10% =
33. 33.304 increased by 25% =
34. 34.158 decreased by 50% =
35. 35.605 increased by 20% =
36. 36.100 decreased by 12% =
37. 37.50 increased by 8% =
38. 38.640 decreased by 5% =
39. 39.460 decreased by 15% =
40. 40.430 decreased by 30% =

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