Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 56 · 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. 1.390 increased by 10% =
2. 2.500 decreased by 5% =
3. 3.96 increased by 25% =
4. 4.790 decreased by 10% =
5. 5.708 decreased by 75% =
6. 6.125 increased by 8% =
7. 7.76 decreased by 50% =
8. 8.100 decreased by 8% =
9. 9.665 increased by 60% =
10. 10.300 decreased by 30% =
11. 11.350 decreased by 30% =
12. 12.498 decreased by 50% =
13. 13.600 decreased by 75% =
14. 14.220 decreased by 5% =
15. 15.260 decreased by 15% =
16. 16.700 decreased by 75% =
17. 17.785 increased by 20% =
18. 18.390 increased by 10% =
19. 19.100 decreased by 60% =
20. 20.475 increased by 20% =
21. 21.525 decreased by 60% =
22. 22.360 decreased by 10% =
23. 23.290 decreased by 30% =
24. 24.260 increased by 50% =
25. 25.744 decreased by 25% =
26. 26.118 increased by 50% =
27. 27.230 decreased by 10% =
28. 28.300 increased by 35% =
29. 29.490 increased by 20% =
30. 30.378 increased by 50% =
31. 31.80 decreased by 35% =
32. 32.275 increased by 60% =
33. 33.530 decreased by 10% =
34. 34.752 decreased by 75% =
35. 35.320 increased by 10% =
36. 36.725 increased by 12% =
37. 37.450 increased by 8% =
38. 38.240 increased by 15% =
39. 39.680 decreased by 5% =
40. 40.260 increased by 5% =

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