You need at least two denominators to find something in common between them.
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least common denominator for 15 and 10 is 30, so 9/15 = 18/30 and 7/10 = 21/30
The Least Common Denominator of 5, 7, and 35 is 1.
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There is none because the Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers.