Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 513 · 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. 1.220 decreased by 75% =
2. 2.210 increased by 10% =
3. 3.678 decreased by 50% =
4. 4.640 decreased by 60% =
5. 5.190 decreased by 10% =
6. 6.350 increased by 8% =
7. 7.120 decreased by 15% =
8. 8.142 increased by 50% =
9. 9.620 decreased by 10% =
10. 10.500 increased by 10% =
11. 11.195 decreased by 20% =
12. 12.472 decreased by 50% =
13. 13.755 increased by 20% =
14. 14.684 decreased by 75% =
15. 15.750 increased by 12% =
16. 16.96 decreased by 25% =
17. 17.700 decreased by 12% =
18. 18.416 increased by 25% =
19. 19.675 decreased by 12% =
20. 20.470 decreased by 60% =
21. 21.780 decreased by 5% =
22. 22.75 increased by 8% =
23. 23.190 increased by 20% =
24. 24.262 decreased by 50% =
25. 25.740 increased by 5% =
26. 26.652 increased by 50% =
27. 27.160 decreased by 5% =
28. 28.375 increased by 12% =
29. 29.680 decreased by 5% =
30. 30.55 increased by 60% =
31. 31.425 decreased by 60% =
32. 32.780 increased by 75% =
33. 33.708 decreased by 50% =
34. 34.625 decreased by 8% =
35. 35.704 decreased by 50% =
36. 36.175 decreased by 12% =
37. 37.105 decreased by 20% =
38. 38.602 decreased by 50% =
39. 39.225 decreased by 12% =
40. 40.115 increased by 40% =

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