Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 22 · 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. 1.225 decreased by 40% =
2. 2.160 increased by 15% =
3. 3.326 decreased by 50% =
4. 4.425 increased by 8% =
5. 5.60 decreased by 50% =
6. 6.440 increased by 10% =
7. 7.534 decreased by 50% =
8. 8.260 increased by 30% =
9. 9.388 increased by 25% =
10. 10.120 decreased by 35% =
11. 11.405 decreased by 20% =
12. 12.400 increased by 5% =
13. 13.524 decreased by 75% =
14. 14.640 decreased by 5% =
15. 15.380 increased by 20% =
16. 16.615 decreased by 20% =
17. 17.460 increased by 5% =
18. 18.90 increased by 30% =
19. 19.80 decreased by 10% =
20. 20.695 decreased by 40% =
21. 21.360 increased by 20% =
22. 22.400 decreased by 5% =
23. 23.736 increased by 50% =
24. 24.52 increased by 75% =
25. 25.680 increased by 15% =
26. 26.580 decreased by 5% =
27. 27.740 decreased by 20% =
28. 28.188 increased by 75% =
29. 29.340 increased by 15% =
30. 30.595 decreased by 20% =
31. 31.216 decreased by 25% =
32. 32.450 decreased by 8% =
33. 33.540 increased by 40% =
34. 34.50 decreased by 40% =
35. 35.470 increased by 30% =
36. 36.170 increased by 20% =
37. 37.540 increased by 15% =
38. 38.260 increased by 35% =
39. 39.720 decreased by 30% =
40. 40.450 decreased by 30% =

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