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Assuming you mean the whole number 5 and the whole number 7, then the common denominator would be 1, as 5/1=5 and 7/1=7.

The GCF of 5 and 7 is 1.

The LCM of 5 and 7 is 35.

If you are talking about common denominators, the LCM is applicable.

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Q: What is the common denominator of 5 of 7?
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