Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 710 · 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. 1.752 increased by 75% =
2. 2.300 decreased by 15% =
3. 3.190 decreased by 40% =
4. 4.125 decreased by 12% =
5. 5.60 increased by 15% =
6. 6.390 decreased by 20% =
7. 7.40 increased by 25% =
8. 8.290 decreased by 10% =
9. 9.46 increased by 50% =
10. 10.550 increased by 8% =
11. 11.292 decreased by 25% =
12. 12.500 increased by 8% =
13. 13.464 increased by 25% =
14. 14.434 increased by 50% =
15. 15.720 decreased by 5% =
16. 16.400 decreased by 8% =
17. 17.122 decreased by 50% =
18. 18.236 increased by 50% =
19. 19.696 decreased by 75% =
20. 20.330 increased by 30% =
21. 21.770 decreased by 40% =
22. 22.200 increased by 12% =
23. 23.325 increased by 8% =
24. 24.525 increased by 12% =
25. 25.56 increased by 25% =
26. 26.320 decreased by 25% =
27. 27.120 increased by 10% =
28. 28.95 decreased by 40% =
29. 29.565 decreased by 60% =
30. 30.315 increased by 20% =
31. 31.575 increased by 12% =
32. 32.620 decreased by 5% =
33. 33.725 increased by 12% =
34. 34.500 decreased by 10% =
35. 35.625 increased by 12% =
36. 36.340 decreased by 35% =
37. 37.600 decreased by 8% =
38. 38.105 increased by 60% =
39. 39.425 increased by 60% =
40. 40.425 increased by 40% =

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