There can be no greatest denominator. Suppose x is the greatest denominator of two numbers a and b. That is to say, x is a multiple of a, x is a multiple of b and x is the greatest such number.
Now consider the number 2x. It is a multiple of a, it is a multiple of b and it is greater than x. This contradicts the statement that x is the greatest such number. So such an x cannot exist.
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The Greatest Common Denominator is 2
4/4
The greatest common denominator is infinite. The least common denominator is 45.
16 = 2428 = 22 * 744 = 22 * 11greatest common denominator: 22 = 4
Their least common denominator is their product. Their greatest common denominator is infinite.