Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 960 · 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. 1.190 decreased by 20% =
2. 2.420 increased by 5% =
3. 3.140 decreased by 15% =
4. 4.760 decreased by 15% =
5. 5.155 increased by 60% =
6. 6.175 decreased by 8% =
7. 7.305 increased by 20% =
8. 8.520 increased by 20% =
9. 9.250 increased by 10% =
10. 10.640 increased by 25% =
11. 11.348 decreased by 50% =
12. 12.475 increased by 8% =
13. 13.532 decreased by 25% =
14. 14.175 decreased by 12% =
15. 15.150 increased by 60% =
16. 16.75 increased by 12% =
17. 17.375 increased by 12% =
18. 18.625 decreased by 40% =
19. 19.122 decreased by 50% =
20. 20.125 decreased by 12% =
21. 21.740 increased by 30% =
22. 22.505 decreased by 40% =
23. 23.360 decreased by 15% =
24. 24.485 increased by 20% =
25. 25.660 decreased by 5% =
26. 26.460 decreased by 5% =
27. 27.600 decreased by 15% =
28. 28.520 decreased by 60% =
29. 29.60 increased by 30% =
30. 30.396 decreased by 25% =
31. 31.715 increased by 60% =
32. 32.775 increased by 8% =
33. 33.415 decreased by 20% =
34. 34.796 decreased by 75% =
35. 35.320 decreased by 35% =
36. 36.240 increased by 10% =
37. 37.140 decreased by 10% =
38. 38.780 increased by 15% =
39. 39.305 decreased by 40% =
40. 40.65 decreased by 40% =

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