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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 least common multiple of 18 15?
The Least Common Multiple (LCM) for 18 15 is 90.
What is the greatest common multiple of 15 and 18?
This cannot be answered because the common multiples of any two or more numbers are infinite.
What is the greatest common factor and the least common multiple of 18 and 20?
The greatest common factor is 2 and the least common multiple is also 2.
What is the greatest common multiple of 18 and 42?
6
What is the greatest common multiple of 10 and 18?
The greatest common multiple of 10 and 18 is infinite.However, I suspect you want either:the greatest common factor of 10 and 18 which is the largest number which divides both 10 and 18 and is 2; orthe lowest common multiple of 10 and 18 which is smallest number into which both 10 and 18 divide (ie the smallest number which is a multiple of both 10 and 18) and is 90
