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If the other numbers are all factors of the greatest number, then that number will be the LCM. Example:

2, 4 & 8: both 2 and 4 are factors of 8, so 8 is the LCM.

2, 3 and 12: same thing, both 2 & 3 are factors of 12.

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Q: How can the LCM be equal to the greatest number in the set?
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Can the LCM in two numbers be equal to the smallest number in the set?

Yes


What numbers have 90 as a greatest common multiple?

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.


A pair of numbers that is the least common multiple and the greatest common factor of 90?

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.


What is the gcm of 84 and 14?

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.


What is the LCM and gcf?

The GCF, or greatest common factor, is the largest number that will divide evenly with no remainder into all the members of a given set of numbers. The LCM, or least common multiple, is the smallest number that all the members of a given set of numbers will divide into evenly with no remainder. Factors go into numbers, numbers go into multiples.