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They need a common denominator when you add them. For example, if you want to add 1/2 and 1/3, you need to change the fractions to equivalents that share the same denominator, so you can combine them.

1/2 + 1/3 = 3/6 + 2/6 = 5/6

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Q: Why do fractions need to have a common denominator?
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