A common denominator, though the least, is 260.
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The lowest common denominator of any two positive numbers is always 1.
A common denominator of 20 and 30 is 600. This is NOT the least common denominator, though.
The common denominator of 9 and 13 is 1
13 = 1 x 13, 20 = 2 x 2 x 5. There are no common factors so the LCM is the product, ie 260.
The least common denominator of 13 and 52 is52