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There can be no greatest common denominator. If you have a set a numbers whose least common denominator is L then 2*L, 3*L, … are all common denominators. There is no end to that sequence and so no greatest.

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6y ago

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Since 54 is a multiple of 18, it will also be the least common denominator of the two.

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9y ago
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Q: What is the most common denominator of 18 and 81?
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