There is really no such thing as a "greatest common multiple". Once you find the least common multiple (LCM) 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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The set of (90,90) has a GCF and an LCM of 90.The set of (-90,-90) has a GCF and an LCM of 90.
This cannot be answered because the common multiples of any two or more numbers are infinite.
This cannot be answered because the common multiples of any two numbers are infinite.The greatest common multiple is an infinite number and not very practical.The GCF is 6.The LCM is 90.
Ummmmm. Your question has no answer as it is written. Either you want the greatest common factor or the least common multiple. Here is both. 36 factors to [2 2 3 3] 90 factors to [2 3 3 5] Common factors are [2 3 3] = 18 ◄ LCM is the product of both numbers divided by the GCF. 36 * 90 / 18 = 180 ◄
The greatest common multiple of any set of multiples is infinite.