Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 648 · 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. 1.670 increased by 50% =
2. 2.555 increased by 20% =
3. 3.325 decreased by 12% =
4. 4.245 increased by 60% =
5. 5.60 decreased by 20% =
6. 6.750 increased by 10% =
7. 7.720 decreased by 35% =
8. 8.444 increased by 75% =
9. 9.50 decreased by 30% =
10. 10.75 increased by 8% =
11. 11.800 decreased by 12% =
12. 12.140 decreased by 40% =
13. 13.204 increased by 25% =
14. 14.265 increased by 20% =
15. 15.618 decreased by 50% =
16. 16.488 decreased by 25% =
17. 17.112 decreased by 50% =
18. 18.308 decreased by 75% =
19. 19.580 decreased by 15% =
20. 20.55 decreased by 20% =
21. 21.240 increased by 15% =
22. 22.100 decreased by 5% =
23. 23.590 decreased by 40% =
24. 24.230 decreased by 30% =
25. 25.240 increased by 15% =
26. 26.100 decreased by 30% =
27. 27.705 increased by 20% =
28. 28.750 increased by 8% =
29. 29.40 increased by 15% =
30. 30.662 increased by 50% =
31. 31.110 increased by 50% =
32. 32.528 decreased by 75% =
33. 33.700 increased by 30% =
34. 34.490 increased by 30% =
35. 35.140 decreased by 35% =
36. 36.50 decreased by 8% =
37. 37.205 decreased by 40% =
38. 38.625 decreased by 12% =
39. 39.704 decreased by 75% =
40. 40.460 decreased by 10% =

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