Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 421 · 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. 1.80 increased by 35% =
2. 2.765 decreased by 40% =
3. 3.180 increased by 75% =
4. 4.450 increased by 12% =
5. 5.580 decreased by 5% =
6. 6.716 increased by 75% =
7. 7.680 increased by 15% =
8. 8.730 decreased by 30% =
9. 9.630 increased by 40% =
10. 10.320 increased by 15% =
11. 11.50 decreased by 8% =
12. 12.194 decreased by 50% =
13. 13.40 increased by 60% =
14. 14.525 increased by 8% =
15. 15.350 increased by 40% =
16. 16.778 increased by 50% =
17. 17.360 increased by 30% =
18. 18.120 decreased by 10% =
19. 19.150 decreased by 8% =
20. 20.590 decreased by 30% =
21. 21.524 increased by 50% =
22. 22.80 increased by 5% =
23. 23.186 increased by 50% =
24. 24.250 increased by 40% =
25. 25.340 increased by 15% =
26. 26.105 increased by 40% =
27. 27.200 decreased by 15% =
28. 28.525 decreased by 12% =
29. 29.180 decreased by 35% =
30. 30.200 increased by 12% =
31. 31.200 increased by 5% =
32. 32.750 decreased by 30% =
33. 33.525 increased by 20% =
34. 34.650 decreased by 30% =
35. 35.200 increased by 8% =
36. 36.520 increased by 40% =
37. 37.650 increased by 12% =
38. 38.600 decreased by 5% =
39. 39.496 increased by 75% =
40. 40.325 increased by 12% =

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