Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 308 · 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. 1.395 decreased by 40% =
2. 2.450 decreased by 8% =
3. 3.716 decreased by 25% =
4. 4.200 increased by 12% =
5. 5.75 increased by 8% =
6. 6.758 increased by 50% =
7. 7.196 increased by 50% =
8. 8.80 increased by 5% =
9. 9.732 increased by 75% =
10. 10.160 increased by 15% =
11. 11.480 decreased by 20% =
12. 12.485 increased by 20% =
13. 13.588 decreased by 25% =
14. 14.780 decreased by 30% =
15. 15.350 decreased by 40% =
16. 16.566 increased by 50% =
17. 17.210 decreased by 20% =
18. 18.575 decreased by 20% =
19. 19.348 increased by 25% =
20. 20.650 increased by 10% =
21. 21.682 decreased by 50% =
22. 22.680 increased by 5% =
23. 23.396 decreased by 50% =
24. 24.760 increased by 15% =
25. 25.700 increased by 5% =
26. 26.508 increased by 75% =
27. 27.800 increased by 5% =
28. 28.125 decreased by 12% =
29. 29.460 decreased by 20% =
30. 30.360 decreased by 35% =
31. 31.250 increased by 10% =
32. 32.350 decreased by 8% =
33. 33.125 decreased by 12% =
34. 34.275 decreased by 8% =
35. 35.300 increased by 25% =
36. 36.130 increased by 40% =
37. 37.610 increased by 40% =
38. 38.230 decreased by 10% =
39. 39.115 increased by 60% =
40. 40.540 increased by 15% =

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