Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 75 · 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. 1.400 increased by 35% =
2. 2.460 increased by 75% =
3. 3.120 decreased by 75% =
4. 4.440 decreased by 5% =
5. 5.580 increased by 10% =
6. 6.525 decreased by 8% =
7. 7.300 increased by 35% =
8. 8.550 decreased by 20% =
9. 9.250 decreased by 60% =
10. 10.650 decreased by 10% =
11. 11.706 decreased by 50% =
12. 12.80 decreased by 35% =
13. 13.720 increased by 15% =
14. 14.75 decreased by 12% =
15. 15.155 decreased by 20% =
16. 16.160 increased by 15% =
17. 17.310 decreased by 10% =
18. 18.120 decreased by 50% =
19. 19.350 decreased by 12% =
20. 20.525 decreased by 8% =
21. 21.120 decreased by 25% =
22. 22.56 decreased by 25% =
23. 23.520 increased by 5% =
24. 24.75 decreased by 12% =
25. 25.656 increased by 25% =
26. 26.400 increased by 8% =
27. 27.580 decreased by 35% =
28. 28.680 increased by 25% =
29. 29.260 decreased by 20% =
30. 30.700 increased by 20% =
31. 31.408 increased by 75% =
32. 32.125 increased by 8% =
33. 33.370 increased by 60% =
34. 34.260 increased by 60% =
35. 35.200 decreased by 8% =
36. 36.540 increased by 30% =
37. 37.342 increased by 50% =
38. 38.525 decreased by 12% =
39. 39.145 increased by 20% =
40. 40.355 increased by 60% =

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