Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 351 · 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. 1.640 increased by 35% =
2. 2.350 increased by 20% =
3. 3.680 increased by 10% =
4. 4.540 decreased by 40% =
5. 5.450 decreased by 12% =
6. 6.260 decreased by 35% =
7. 7.110 decreased by 10% =
8. 8.575 decreased by 12% =
9. 9.260 decreased by 30% =
10. 10.130 decreased by 20% =
11. 11.200 decreased by 8% =
12. 12.440 increased by 10% =
13. 13.800 increased by 5% =
14. 14.150 decreased by 10% =
15. 15.130 decreased by 50% =
16. 16.345 decreased by 60% =
17. 17.555 decreased by 20% =
18. 18.600 increased by 35% =
19. 19.500 decreased by 30% =
20. 20.568 decreased by 25% =
21. 21.675 decreased by 8% =
22. 22.765 increased by 20% =
23. 23.200 increased by 50% =
24. 24.100 increased by 35% =
25. 25.330 decreased by 30% =
26. 26.265 increased by 20% =
27. 27.220 increased by 30% =
28. 28.375 decreased by 12% =
29. 29.220 decreased by 35% =
30. 30.355 increased by 40% =
31. 31.600 decreased by 15% =
32. 32.590 increased by 10% =
33. 33.105 decreased by 60% =
34. 34.525 decreased by 12% =
35. 35.80 increased by 60% =
36. 36.280 increased by 40% =
37. 37.240 increased by 5% =
38. 38.256 increased by 50% =
39. 39.500 increased by 8% =
40. 40.760 increased by 30% =

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