Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 708 · 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. 1.560 decreased by 15% =
2. 2.108 increased by 75% =
3. 3.350 increased by 20% =
4. 4.50 decreased by 8% =
5. 5.50 increased by 30% =
6. 6.240 increased by 60% =
7. 7.272 decreased by 75% =
8. 8.125 increased by 8% =
9. 9.150 increased by 40% =
10. 10.50 increased by 8% =
11. 11.360 decreased by 15% =
12. 12.380 increased by 15% =
13. 13.772 decreased by 25% =
14. 14.785 increased by 20% =
15. 15.300 decreased by 5% =
16. 16.100 decreased by 10% =
17. 17.260 decreased by 30% =
18. 18.102 decreased by 50% =
19. 19.800 increased by 5% =
20. 20.325 increased by 60% =
21. 21.355 decreased by 40% =
22. 22.775 increased by 8% =
23. 23.628 increased by 75% =
24. 24.205 decreased by 20% =
25. 25.520 decreased by 5% =
26. 26.40 increased by 10% =
27. 27.640 decreased by 30% =
28. 28.580 increased by 15% =
29. 29.130 decreased by 30% =
30. 30.740 decreased by 10% =
31. 31.600 increased by 5% =
32. 32.580 increased by 35% =
33. 33.740 increased by 35% =
34. 34.120 decreased by 10% =
35. 35.570 decreased by 60% =
36. 36.340 increased by 30% =
37. 37.200 increased by 20% =
38. 38.470 increased by 10% =
39. 39.618 decreased by 50% =
40. 40.425 increased by 8% =

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