The common denominator of any two or more whole numbers, such as 3 9 and 11, 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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1188 is a common denominator for 9,11,12
9
since 9 and 11 have no common factors, the LCD is 99
9 is the common denominator. 2/3 = 6/9.
9