Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 84 · 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. 1.228 increased by 75% =
2. 2.168 increased by 50% =
3. 3.40 increased by 15% =
4. 4.620 increased by 35% =
5. 5.560 decreased by 10% =
6. 6.256 decreased by 75% =
7. 7.230 decreased by 30% =
8. 8.120 increased by 75% =
9. 9.300 increased by 75% =
10. 10.180 decreased by 35% =
11. 11.372 decreased by 25% =
12. 12.215 increased by 20% =
13. 13.256 increased by 25% =
14. 14.705 decreased by 40% =
15. 15.700 increased by 5% =
16. 16.40 increased by 20% =
17. 17.400 increased by 15% =
18. 18.400 decreased by 15% =
19. 19.175 decreased by 12% =
20. 20.720 decreased by 5% =
21. 21.228 increased by 75% =
22. 22.72 decreased by 25% =
23. 23.775 decreased by 12% =
24. 24.466 decreased by 50% =
25. 25.152 decreased by 50% =
26. 26.296 decreased by 50% =
27. 27.800 increased by 12% =
28. 28.200 decreased by 5% =
29. 29.420 increased by 15% =
30. 30.60 increased by 40% =
31. 31.760 increased by 30% =
32. 32.720 increased by 5% =
33. 33.460 increased by 5% =
34. 34.40 decreased by 60% =
35. 35.352 increased by 75% =
36. 36.180 increased by 15% =
37. 37.772 decreased by 50% =
38. 38.480 increased by 15% =
39. 39.680 decreased by 15% =
40. 40.675 increased by 12% =

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