Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 123 · 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. 1.244 increased by 25% =
2. 2.560 increased by 10% =
3. 3.720 decreased by 15% =
4. 4.80 increased by 40% =
5. 5.585 decreased by 20% =
6. 6.725 increased by 12% =
7. 7.660 increased by 35% =
8. 8.670 increased by 10% =
9. 9.320 increased by 15% =
10. 10.65 increased by 60% =
11. 11.195 increased by 20% =
12. 12.700 increased by 10% =
13. 13.314 decreased by 50% =
14. 14.325 increased by 60% =
15. 15.740 decreased by 30% =
16. 16.315 increased by 60% =
17. 17.100 decreased by 20% =
18. 18.480 increased by 5% =
19. 19.600 decreased by 20% =
20. 20.300 increased by 10% =
21. 21.210 increased by 10% =
22. 22.520 increased by 10% =
23. 23.210 increased by 40% =
24. 24.750 increased by 8% =
25. 25.600 increased by 8% =
26. 26.580 increased by 10% =
27. 27.185 decreased by 20% =
28. 28.750 increased by 12% =
29. 29.420 increased by 30% =
30. 30.175 decreased by 12% =
31. 31.120 increased by 10% =
32. 32.280 decreased by 5% =
33. 33.380 increased by 10% =
34. 34.500 increased by 30% =
35. 35.70 decreased by 10% =
36. 36.125 increased by 60% =
37. 37.750 increased by 60% =
38. 38.725 increased by 8% =
39. 39.300 decreased by 50% =
40. 40.100 decreased by 15% =

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