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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The Least Common Denominator of 5, 7, and 35 is 1.
210
It is 70
it would be (5*7*11 = 385)
105