Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 267 · 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. 1.260 decreased by 25% =
2. 2.304 decreased by 50% =
3. 3.240 increased by 10% =
4. 4.205 decreased by 60% =
5. 5.160 decreased by 35% =
6. 6.770 decreased by 20% =
7. 7.500 increased by 5% =
8. 8.632 decreased by 50% =
9. 9.600 decreased by 5% =
10. 10.60 decreased by 75% =
11. 11.680 increased by 5% =
12. 12.172 decreased by 25% =
13. 13.520 increased by 15% =
14. 14.635 decreased by 40% =
15. 15.125 increased by 12% =
16. 16.140 decreased by 35% =
17. 17.690 decreased by 10% =
18. 18.335 increased by 60% =
19. 19.425 decreased by 8% =
20. 20.60 increased by 5% =
21. 21.400 decreased by 30% =
22. 22.105 increased by 60% =
23. 23.248 decreased by 25% =
24. 24.580 increased by 5% =
25. 25.525 increased by 12% =
26. 26.92 increased by 25% =
27. 27.632 increased by 75% =
28. 28.468 decreased by 50% =
29. 29.560 increased by 30% =
30. 30.752 decreased by 50% =
31. 31.175 increased by 40% =
32. 32.260 decreased by 35% =
33. 33.455 increased by 20% =
34. 34.225 increased by 12% =
35. 35.175 increased by 12% =
36. 36.670 decreased by 40% =
37. 37.96 increased by 50% =
38. 38.610 increased by 30% =
39. 39.60 increased by 30% =
40. 40.160 increased by 5% =

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