Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 145 · 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. 1.225 increased by 12% =
2. 2.460 decreased by 20% =
3. 3.160 increased by 35% =
4. 4.328 decreased by 75% =
5. 5.125 decreased by 20% =
6. 6.380 decreased by 75% =
7. 7.520 increased by 35% =
8. 8.225 decreased by 8% =
9. 9.220 decreased by 15% =
10. 10.200 increased by 15% =
11. 11.650 decreased by 30% =
12. 12.780 decreased by 30% =
13. 13.40 decreased by 5% =
14. 14.410 increased by 40% =
15. 15.720 increased by 10% =
16. 16.376 decreased by 50% =
17. 17.460 decreased by 15% =
18. 18.504 increased by 25% =
19. 19.120 increased by 15% =
20. 20.200 increased by 15% =
21. 21.100 decreased by 12% =
22. 22.730 increased by 60% =
23. 23.150 increased by 8% =
24. 24.770 increased by 40% =
25. 25.360 increased by 40% =
26. 26.135 increased by 60% =
27. 27.780 increased by 5% =
28. 28.480 decreased by 5% =
29. 29.152 decreased by 25% =
30. 30.120 increased by 30% =
31. 31.800 increased by 15% =
32. 32.370 increased by 10% =
33. 33.524 decreased by 75% =
34. 34.525 increased by 60% =
35. 35.375 decreased by 12% =
36. 36.606 decreased by 50% =
37. 37.500 increased by 10% =
38. 38.800 increased by 25% =
39. 39.275 increased by 12% =
40. 40.320 decreased by 25% =

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