Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 709 · 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. 1.508 increased by 75% =
2. 2.550 increased by 10% =
3. 3.765 increased by 20% =
4. 4.220 decreased by 15% =
5. 5.40 increased by 50% =
6. 6.388 increased by 75% =
7. 7.72 increased by 25% =
8. 8.660 decreased by 5% =
9. 9.152 decreased by 75% =
10. 10.225 decreased by 40% =
11. 11.625 decreased by 12% =
12. 12.70 increased by 30% =
13. 13.800 increased by 12% =
14. 14.635 increased by 20% =
15. 15.755 increased by 20% =
16. 16.380 increased by 35% =
17. 17.330 increased by 10% =
18. 18.575 increased by 12% =
19. 19.190 increased by 20% =
20. 20.385 decreased by 60% =
21. 21.236 increased by 75% =
22. 22.145 increased by 40% =
23. 23.380 decreased by 5% =
24. 24.208 increased by 75% =
25. 25.100 decreased by 35% =
26. 26.396 increased by 75% =
27. 27.760 decreased by 5% =
28. 28.692 decreased by 25% =
29. 29.184 increased by 25% =
30. 30.420 increased by 5% =
31. 31.195 increased by 60% =
32. 32.550 increased by 12% =
33. 33.565 increased by 20% =
34. 34.180 decreased by 5% =
35. 35.600 decreased by 15% =
36. 36.192 decreased by 25% =
37. 37.100 increased by 60% =
38. 38.396 increased by 75% =
39. 39.75 increased by 8% =
40. 40.150 decreased by 8% =

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