Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 806 · 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. 1.650 increased by 8% =
2. 2.440 decreased by 50% =
3. 3.324 decreased by 75% =
4. 4.270 increased by 60% =
5. 5.325 increased by 20% =
6. 6.520 increased by 35% =
7. 7.50 increased by 8% =
8. 8.800 increased by 12% =
9. 9.110 increased by 10% =
10. 10.90 decreased by 10% =
11. 11.640 increased by 5% =
12. 12.336 decreased by 75% =
13. 13.500 increased by 20% =
14. 14.780 increased by 5% =
15. 15.764 increased by 25% =
16. 16.300 decreased by 12% =
17. 17.600 increased by 5% =
18. 18.450 increased by 12% =
19. 19.560 increased by 5% =
20. 20.380 increased by 30% =
21. 21.760 increased by 15% =
22. 22.150 increased by 8% =
23. 23.100 decreased by 12% =
24. 24.225 increased by 12% =
25. 25.560 increased by 15% =
26. 26.70 increased by 10% =
27. 27.300 increased by 8% =
28. 28.75 decreased by 8% =
29. 29.550 decreased by 8% =
30. 30.780 decreased by 30% =
31. 31.180 decreased by 20% =
32. 32.120 increased by 30% =
33. 33.420 decreased by 25% =
34. 34.370 decreased by 60% =
35. 35.410 increased by 20% =
36. 36.55 decreased by 60% =
37. 37.540 increased by 20% =
38. 38.520 increased by 10% =
39. 39.220 decreased by 15% =
40. 40.375 increased by 20% =

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