Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 46 · 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 decreased by 75% =
2. 2.425 increased by 60% =
3. 3.292 increased by 75% =
4. 4.80 decreased by 10% =
5. 5.644 increased by 75% =
6. 6.340 decreased by 10% =
7. 7.125 increased by 8% =
8. 8.455 increased by 20% =
9. 9.680 decreased by 10% =
10. 10.728 decreased by 25% =
11. 11.45 increased by 20% =
12. 12.800 decreased by 30% =
13. 13.195 increased by 40% =
14. 14.650 increased by 12% =
15. 15.445 increased by 60% =
16. 16.260 increased by 15% =
17. 17.50 decreased by 10% =
18. 18.370 increased by 40% =
19. 19.540 increased by 20% =
20. 20.68 increased by 25% =
21. 21.460 increased by 5% =
22. 22.760 decreased by 15% =
23. 23.80 decreased by 15% =
24. 24.626 increased by 50% =
25. 25.420 increased by 15% =
26. 26.380 increased by 20% =
27. 27.700 increased by 12% =
28. 28.684 decreased by 75% =
29. 29.160 decreased by 35% =
30. 30.240 decreased by 40% =
31. 31.450 increased by 10% =
32. 32.50 decreased by 8% =
33. 33.660 decreased by 60% =
34. 34.448 increased by 50% =
35. 35.760 increased by 5% =
36. 36.720 decreased by 10% =
37. 37.380 increased by 5% =
38. 38.540 increased by 15% =
39. 39.730 decreased by 50% =
40. 40.545 decreased by 40% =

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