Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 10 · 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. 1.380 decreased by 50% =
2. 2.150 increased by 12% =
3. 3.650 increased by 20% =
4. 4.240 decreased by 40% =
5. 5.290 decreased by 20% =
6. 6.540 decreased by 35% =
7. 7.600 decreased by 8% =
8. 8.255 decreased by 60% =
9. 9.170 decreased by 30% =
10. 10.48 increased by 75% =
11. 11.420 decreased by 10% =
12. 12.720 increased by 5% =
13. 13.48 decreased by 75% =
14. 14.325 decreased by 8% =
15. 15.80 decreased by 5% =
16. 16.220 increased by 15% =
17. 17.656 increased by 25% =
18. 18.188 decreased by 25% =
19. 19.750 decreased by 8% =
20. 20.390 decreased by 40% =
21. 21.708 decreased by 25% =
22. 22.60 increased by 35% =
23. 23.425 increased by 8% =
24. 24.575 increased by 40% =
25. 25.370 decreased by 60% =
26. 26.600 increased by 35% =
27. 27.525 increased by 8% =
28. 28.50 decreased by 10% =
29. 29.175 increased by 8% =
30. 30.460 decreased by 15% =
31. 31.740 increased by 5% =
32. 32.46 increased by 50% =
33. 33.346 increased by 50% =
34. 34.700 increased by 8% =
35. 35.770 decreased by 20% =
36. 36.400 increased by 8% =
37. 37.692 increased by 75% =
38. 38.665 decreased by 20% =
39. 39.122 increased by 50% =
40. 40.200 decreased by 12% =

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