Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 760 · 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. 1.325 decreased by 8% =
2. 2.665 increased by 20% =
3. 3.615 increased by 20% =
4. 4.88 increased by 25% =
5. 5.600 decreased by 10% =
6. 6.72 increased by 25% =
7. 7.360 increased by 50% =
8. 8.615 decreased by 60% =
9. 9.280 decreased by 20% =
10. 10.540 decreased by 35% =
11. 11.240 decreased by 15% =
12. 12.176 decreased by 75% =
13. 13.220 increased by 15% =
14. 14.220 decreased by 15% =
15. 15.455 decreased by 20% =
16. 16.180 decreased by 40% =
17. 17.300 decreased by 8% =
18. 18.670 increased by 10% =
19. 19.380 decreased by 5% =
20. 20.720 decreased by 15% =
21. 21.786 increased by 50% =
22. 22.212 increased by 25% =
23. 23.120 decreased by 40% =
24. 24.425 increased by 60% =
25. 25.120 decreased by 30% =
26. 26.330 decreased by 40% =
27. 27.180 decreased by 15% =
28. 28.760 increased by 35% =
29. 29.80 increased by 35% =
30. 30.740 increased by 30% =
31. 31.580 increased by 30% =
32. 32.160 increased by 30% =
33. 33.440 increased by 15% =
34. 34.152 decreased by 75% =
35. 35.670 decreased by 10% =
36. 36.60 increased by 5% =
37. 37.375 decreased by 20% =
38. 38.500 increased by 30% =
39. 39.500 increased by 35% =
40. 40.365 decreased by 40% =

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