You can add or subtract fractions only if they are "like" fractions, that is, only if they have the same denominator - unless you know your fractions really well.
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You don't need a common denominator to divide fractions.
No only when adding or subtracting fractions a common denominator is needed
No, You only need a common denominator when adding or subtracting fractions.
No.
You don't need a common denominator to divide fractions.