The common denominator of any two or more whole numbers will always be one (1) because common denominators refers to the denominators of two or more fractions or mixed numbers, not whole numbers. So, a set of whole numbers (x,x) would have to be converted to their fraction equivalents, i.e., x/1,which will always yield a denominator of 1.
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A common denominator, though not the least, is 63000.
672
504
The LCD for 4/7 and 7/8 is 56.
1/7 + 3/8 = 8/56 + 21/56 is the lowest common denominator.