You need at least two numbers to find something in common.
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That's the least common denominator or LCD.
The least common denominator.
The least common multiple of two or more denominators is known as the least common denominator, or LCD.
least common denominator
The common denominator of any two or more whole numbers, such as 100 and 150, 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.