The word "common" should suggest that this is a concept that applies to more than one number. There is, therefore, no sensible answer to this question.
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The lowest common denominator of 5/6 and 3/8 is 24.
The lowest common denominator is 30
Oh, dude, the common denominator of 3 and 6 is 6. It's like the lowest common denominator that they both agree on, you know? So, if 3 and 6 were at a party, 6 would be the chill friend they both have in common.
The lowest common denominator of the fractions 2 over 9 and 1 over 6 is 18.
Find the lowest common multiple of the denominators then multiply the top and bottom of the fractions to get this denominator. so for example for: 1/3 + 1/2 the lowest common multiple is 6. 6 = 3 x 2 so 1/3 = 2x1/2x3 = 2/6 and 1/2 = 3x1/3x2 = 3/6 therefore 1/3 + 1/2 = 2/6 + 3/6 = 2+3/6 = 5/6 and it works for much bigger numbers too