Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 269 · 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. 1.515 increased by 40% =
2. 2.412 increased by 25% =
3. 3.460 decreased by 5% =
4. 4.46 decreased by 50% =
5. 5.180 decreased by 10% =
6. 6.580 increased by 25% =
7. 7.780 decreased by 30% =
8. 8.708 increased by 25% =
9. 9.320 increased by 15% =
10. 10.670 increased by 60% =
11. 11.360 increased by 15% =
12. 12.80 increased by 5% =
13. 13.680 decreased by 60% =
14. 14.384 decreased by 25% =
15. 15.95 decreased by 20% =
16. 16.105 increased by 40% =
17. 17.480 decreased by 5% =
18. 18.356 increased by 25% =
19. 19.45 decreased by 40% =
20. 20.44 increased by 75% =
21. 21.710 decreased by 40% =
22. 22.350 decreased by 12% =
23. 23.225 decreased by 8% =
24. 24.605 increased by 40% =
25. 25.548 increased by 50% =
26. 26.600 increased by 40% =
27. 27.100 increased by 12% =
28. 28.520 decreased by 15% =
29. 29.224 decreased by 25% =
30. 30.300 increased by 40% =
31. 31.490 increased by 40% =
32. 32.695 increased by 60% =
33. 33.600 increased by 50% =
34. 34.250 increased by 30% =
35. 35.760 increased by 35% =
36. 36.100 decreased by 12% =
37. 37.156 increased by 50% =
38. 38.70 decreased by 20% =
39. 39.64 increased by 75% =
40. 40.365 decreased by 60% =

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