Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 276 · 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. 1.785 increased by 20% =
2. 2.400 decreased by 12% =
3. 3.225 decreased by 8% =
4. 4.120 increased by 35% =
5. 5.300 increased by 8% =
6. 6.460 decreased by 10% =
7. 7.75 decreased by 8% =
8. 8.132 increased by 75% =
9. 9.120 increased by 20% =
10. 10.300 increased by 15% =
11. 11.134 decreased by 50% =
12. 12.680 decreased by 15% =
13. 13.604 decreased by 75% =
14. 14.430 decreased by 30% =
15. 15.484 decreased by 75% =
16. 16.448 decreased by 25% =
17. 17.715 decreased by 20% =
18. 18.722 decreased by 50% =
19. 19.224 decreased by 75% =
20. 20.60 increased by 20% =
21. 21.160 increased by 30% =
22. 22.660 increased by 10% =
23. 23.700 decreased by 15% =
24. 24.300 increased by 35% =
25. 25.150 increased by 30% =
26. 26.765 decreased by 40% =
27. 27.760 decreased by 30% =
28. 28.140 decreased by 5% =
29. 29.300 decreased by 15% =
30. 30.220 increased by 35% =
31. 31.720 increased by 10% =
32. 32.120 decreased by 30% =
33. 33.765 increased by 60% =
34. 34.135 increased by 20% =
35. 35.525 increased by 12% =
36. 36.380 increased by 30% =
37. 37.400 increased by 12% =
38. 38.40 increased by 30% =
39. 39.752 decreased by 25% =
40. 40.610 increased by 60% =

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