The lowest common denominator of any two or more whole numbers, such as 9 11 14 and 21, 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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Assuming those are denominators of fractions you wish to add or subtract, you can use any common multiple of 4 and 14; the Lowest Common Multiple (LCM), often called the Lowest Common Denominator (LCD) especially when when referring to the denominators of fraction, provides the smallest numerators. For 4 and 14, the LCM is 28.
The common denominator is 28.
3/7 u divide 6 by 2 and 14 by 2 because its the lcd or lowest common denominator(same number they have in comon
The lowest common multiple of 8 and 14 is 56.