Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 691 · 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. 1.160 decreased by 35% =
2. 2.156 decreased by 25% =
3. 3.580 increased by 40% =
4. 4.735 decreased by 40% =
5. 5.685 decreased by 60% =
6. 6.460 decreased by 30% =
7. 7.425 increased by 40% =
8. 8.560 increased by 15% =
9. 9.256 decreased by 75% =
10. 10.280 increased by 35% =
11. 11.320 increased by 20% =
12. 12.75 increased by 12% =
13. 13.200 increased by 12% =
14. 14.605 decreased by 20% =
15. 15.568 increased by 25% =
16. 16.300 increased by 35% =
17. 17.660 increased by 40% =
18. 18.700 decreased by 12% =
19. 19.100 increased by 15% =
20. 20.300 increased by 8% =
21. 21.500 decreased by 15% =
22. 22.134 decreased by 50% =
23. 23.270 increased by 20% =
24. 24.648 decreased by 75% =
25. 25.106 increased by 50% =
26. 26.350 increased by 8% =
27. 27.752 increased by 50% =
28. 28.350 increased by 50% =
29. 29.200 decreased by 12% =
30. 30.656 increased by 25% =
31. 31.430 decreased by 40% =
32. 32.220 decreased by 10% =
33. 33.460 decreased by 5% =
34. 34.424 decreased by 25% =
35. 35.675 increased by 12% =
36. 36.750 increased by 12% =
37. 37.615 decreased by 60% =
38. 38.740 increased by 75% =
39. 39.480 decreased by 5% =
40. 40.170 increased by 20% =

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