25 is.
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Least common denominator: the smallest multiple or factor that is exactly divisible by every member of a set of numbers. Factors of 25: 1, 5, 25 Factors of 30: 1,3,5,10,30 Shared factors of 25 and 30: 1,5 Therefore, the least common denominator would be 1 because it is the smallest factor shared between the two numbers.
There are infinitely many common denominators and so it makes no sense to ask about the common denominator. For example, 45000 is a common denominator.
A common denominator is 55.