The common denominator of any two or more whole numbers, such as 7 8 13 and 9, will always be one (1) because 'common denominator' 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
82
The LCD for 4/7 and 7/8 is 56.