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There is really no such thing as a "greatest common multiple". Once you find the least common multiple of a set of numbers, you can keep adding the LCM to itself over and over again. Each new number you get will be a common multiple of your set of numbers, but each new number will always be larger than the previous. This means that you can keep adding while the number approaches infinity and you will still never find a greatest multiple.
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What is the GCM of 7 and 13?
There can be no GCM (Greatest Common Multiple). Suppose a GCM exists and suppose it is x. That is, x is the GCM of 7 and 13, then 2x is a multiple of both 7 and 13 and is greater than x. This contradicts the statement that x is the GCM. So x cannot be the GCM.
What is the GCM of 64 and 80?
The GCM of any set of numbers is infinite.
What is the GCM of 25 and 45?
The GCF is 5. The LCM is 225. The GCM is infinite.
What is the GCM of 12 and 15?
There is no such thing as a Greatest Common Multiple - there are such terms as Lowest Common Multiple, and Greatest Common Factor.
What is the GCM of 4 and 6?
12
