if you mean common factor then it is 4
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A common denominator, though not the least, is 1056.
The Least Common Denominator of 3/4 and 7/8 is 8.
The common denominator will be the LCM of these numbers, which is 120.
Oh, dude, the common denominator for 8, 4, and 3 is like... 1. Because, you know, they don't have any common factors other than 1. So, yeah, that's it. Math can be simple sometimes, right?
5/8 - 1/4 = 5/8 - 2/8 = 3/8 (make all fractions equivalent fractions with a common denominator - in this case, a common denominator of 8 - and then subtract the numerators).