There is none because the Least Common Denominator (or LCD) refers to the Least Common Multiple (LCM) of the denominators of two or more fractions or mixed numbers. Even if you converted your whole numbers (x) to their fraction equivalents (x/1), the LCD would always be 1.
If those are denominators, the LCD is 630.
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The least common denominator (LCD) is 630.
A common denominator, though not the least, is 30.
60
You need at least one more fraction in order to have a common denominator.
At least two fractions are needed to determine a common denominator.