Percentage Increase and Decrease Trick Worksheet

Speed calculation lesson 23: Increase or decrease by a percent · Set 805 · 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. 1.778 decreased by 50% =
2. 2.150 increased by 30% =
3. 3.700 increased by 12% =
4. 4.500 increased by 12% =
5. 5.660 decreased by 60% =
6. 6.265 decreased by 20% =
7. 7.632 decreased by 75% =
8. 8.560 decreased by 5% =
9. 9.495 increased by 20% =
10. 10.600 increased by 10% =
11. 11.500 increased by 15% =
12. 12.585 increased by 20% =
13. 13.170 decreased by 10% =
14. 14.280 decreased by 35% =
15. 15.100 decreased by 40% =
16. 16.260 decreased by 15% =
17. 17.650 decreased by 8% =
18. 18.768 decreased by 50% =
19. 19.100 increased by 8% =
20. 20.280 increased by 75% =
21. 21.500 decreased by 10% =
22. 22.80 increased by 30% =
23. 23.395 decreased by 20% =
24. 24.604 decreased by 50% =
25. 25.125 increased by 60% =
26. 26.765 increased by 20% =
27. 27.328 decreased by 50% =
28. 28.734 decreased by 50% =
29. 29.125 decreased by 60% =
30. 30.195 increased by 40% =
31. 31.200 decreased by 12% =
32. 32.275 increased by 8% =
33. 33.165 increased by 60% =
34. 34.365 increased by 20% =
35. 35.625 increased by 12% =
36. 36.406 increased by 50% =
37. 37.170 increased by 10% =
38. 38.660 increased by 40% =
39. 39.220 decreased by 5% =
40. 40.195 decreased by 20% =

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