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Find a common denominator. 21 is common. Multiply the fractions to achieve a common denominator of 21. 3/7 + 2/3 = 9/21 + 14/21 = 23/21
The common denominator of any two or more whole numbers, such as 21 and 14, 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.
20 and 14 are both integers. The common denominator of 20/1 and 14/1 is 1. The least common multiple is 140.