the 3 comon fractions are: 1/2, 1/4, 1/3
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There is none. A least common denominator is to be found between or among fractions. 3 and 7 are not fractions.
15
The least common denominator of the fractions 3/5 and 5/12 is 60.
They are equivalent fractions. For example, if you are adding 1/2 and 1/3 and the common denominator is 6, the two new fractions are 3/6 and 2/6 respectively.
The Least Common Multiple of 3 and 5 is 15, which would be the denominator to use for fractions with the denominators 3 and 5.