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There is none because the Least Common Denominator (or LCD) is the Least Common Multiple (LCM) of the denominators of two or more fractions. Even if you converted your numbers (x) to their fraction equivalents (x/1), the LCD will always be 1.

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11y ago
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8y ago
For a common denominator of 7 and 21 you can use any multiple of their Lowest Common Multiple:

LCM(7, 21) = 21

So you can use any of 21, 42, 63, ... as a common denominator.
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7y ago

The least common factor of any set of integers is 1.

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Q: What is the least common factor of 21 24 and 27?
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