The lowest common FACTOR of 7,3 and 2 is 42.
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The lowest common denominator of 4/25 and 3/50 is 50.
The lowest common denominator of 5/6 and 3/8 is 24.
The easiest way is through prime factorization. Example: 1/30 and 1/42 The lowest common denominator in this case is the LCM of 30 and 42. 2 x 3 x 5 = 30 2 x 3 x 7 = 42 2 x 3 x 5 x 7 = 210, the LCM and the lowest common denominator.
20
The lowest common denominator of any set of whole numbers is 1