Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 332 · 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. 1.250 decreased by 30% =
2. 2.352 increased by 75% =
3. 3.204 decreased by 25% =
4. 4.660 increased by 15% =
5. 5.296 increased by 75% =
6. 6.400 increased by 60% =
7. 7.620 decreased by 20% =
8. 8.250 decreased by 12% =
9. 9.500 increased by 8% =
10. 10.380 increased by 20% =
11. 11.220 decreased by 15% =
12. 12.58 decreased by 50% =
13. 13.136 decreased by 50% =
14. 14.800 increased by 8% =
15. 15.50 increased by 8% =
16. 16.480 decreased by 15% =
17. 17.400 decreased by 5% =
18. 18.184 increased by 75% =
19. 19.500 increased by 15% =
20. 20.120 increased by 10% =
21. 21.596 increased by 75% =
22. 22.650 decreased by 12% =
23. 23.592 decreased by 25% =
24. 24.530 increased by 40% =
25. 25.475 increased by 8% =
26. 26.800 increased by 10% =
27. 27.125 decreased by 8% =
28. 28.690 decreased by 20% =
29. 29.434 decreased by 50% =
30. 30.800 increased by 15% =
31. 31.200 increased by 5% =
32. 32.44 increased by 50% =
33. 33.280 increased by 15% =
34. 34.420 decreased by 5% =
35. 35.615 decreased by 40% =
36. 36.325 increased by 12% =
37. 37.650 increased by 12% =
38. 38.75 decreased by 12% =
39. 39.90 increased by 20% =
40. 40.220 decreased by 20% =

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