The lowest common denominator of any two positive numbers is always 1.
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The denominators of 20 and 15 are both 1, therefore, the lowest common denominator is 1.
The answer is 20.
20 is the lowest common denominator for 4 and 10.
The lowest common denominator is 40 5/8 = 25/40 13/20 = 26/40 so 13/20 is bigger
A common denominator, though the least, is 260.