The common denominator of any two or more whole numbers will always be 1.
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84
84/14 = 6 84/7 = 12 84/3 = 28 Hence 84 is the least common denominator
LCM(12, 14) = 84
20 and 14 are both integers. The common denominator of 20/1 and 14/1 is 1. The least common multiple is 140.
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