Which number can be used as a common denominator for the fractions 1/4 and 5/6
?

There is an infinite number of common denominators, but 12 is the least common denominator.  You could also use any other number that is a multiple of 12, such as 24, 36, and 48.

12 is the least common denominator because it is the smallest number that is a multiple of both 4 and 6.

You can also use any other multiples of 12 because they are all multiples of 4 and 6.

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