Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 511 · 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. 1.420 increased by 15% =
2. 2.600 increased by 8% =
3. 3.490 increased by 10% =
4. 4.270 increased by 10% =
5. 5.320 decreased by 5% =
6. 6.420 increased by 5% =
7. 7.192 decreased by 50% =
8. 8.740 increased by 10% =
9. 9.280 decreased by 5% =
10. 10.496 increased by 25% =
11. 11.425 increased by 8% =
12. 12.460 decreased by 35% =
13. 13.725 increased by 8% =
14. 14.380 increased by 15% =
15. 15.314 decreased by 50% =
16. 16.385 decreased by 20% =
17. 17.130 decreased by 10% =
18. 18.290 decreased by 10% =
19. 19.354 increased by 50% =
20. 20.465 decreased by 40% =
21. 21.260 increased by 5% =
22. 22.280 increased by 5% =
23. 23.240 decreased by 30% =
24. 24.440 increased by 20% =
25. 25.380 decreased by 10% =
26. 26.130 increased by 10% =
27. 27.600 increased by 8% =
28. 28.750 increased by 10% =
29. 29.750 increased by 12% =
30. 30.230 increased by 30% =
31. 31.336 decreased by 25% =
32. 32.480 decreased by 15% =
33. 33.740 increased by 10% =
34. 34.145 increased by 40% =
35. 35.496 increased by 75% =
36. 36.575 increased by 8% =
37. 37.296 increased by 75% =
38. 38.325 increased by 8% =
39. 39.90 increased by 30% =
40. 40.360 increased by 50% =

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