There is really so 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.
Since 98 is a single number, you could say that it shares all of its multiples with itself. The first few multiples of 98 are: 98, 196, 294, 392, and 490.
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There can be no greatest common multiple. If x were the greatest common multiple, then 2x would be a still greater common multiple. So x could not be the greatest. Thus there is no such thing as a greatest common multiple.
Since 90 is a multiple of 18, 18 is the GCF of 18 and 90
The Least Common Multiple of 110 and 98 is 5,390.
The greatest common multiple of any set of integers is infinite.
The greatest common multiple of any set of integers is infinite.