A common denominator, though not the least one, is 180.
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The common denominator of any two or more whole numbers will always be 1.
60
The common denominator of 15 and 9 is 45.
12 and 15 go into the denominator 60. 1 and 3 go into 12 and 15.
The greatest common denominator is infinite. The least common denominator is 45.