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Because it's easier to get the correct answer this way. Example: 1/3 + 1/4. Without a common denominator, what do you think the answer would be? 1/7? 2/7? 11/34?

The correct answer is 7/12, which can most easily be found by converting 1/3 to 4/12 and 1/4 to 3/12.

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Q: Why do you need a common denominator to add unlike fractions?
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