Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 613 · 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. 1.680 increased by 40% =
2. 2.425 decreased by 8% =
3. 3.80 decreased by 35% =
4. 4.360 increased by 15% =
5. 5.350 decreased by 20% =
6. 6.492 increased by 25% =
7. 7.800 increased by 12% =
8. 8.765 increased by 20% =
9. 9.710 decreased by 60% =
10. 10.580 increased by 15% =
11. 11.350 decreased by 10% =
12. 12.732 decreased by 75% =
13. 13.190 increased by 20% =
14. 14.55 increased by 60% =
15. 15.120 decreased by 30% =
16. 16.460 decreased by 5% =
17. 17.150 decreased by 12% =
18. 18.90 decreased by 30% =
19. 19.340 increased by 10% =
20. 20.600 decreased by 12% =
21. 21.80 decreased by 35% =
22. 22.650 decreased by 30% =
23. 23.680 decreased by 5% =
24. 24.656 increased by 25% =
25. 25.420 increased by 40% =
26. 26.60 increased by 5% =
27. 27.554 increased by 50% =
28. 28.330 decreased by 50% =
29. 29.125 increased by 20% =
30. 30.348 increased by 25% =
31. 31.736 increased by 75% =
32. 32.40 decreased by 15% =
33. 33.420 decreased by 5% =
34. 34.165 decreased by 20% =
35. 35.200 decreased by 30% =
36. 36.600 decreased by 8% =
37. 37.672 increased by 50% =
38. 38.660 increased by 15% =
39. 39.152 increased by 75% =
40. 40.750 increased by 12% =

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