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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Oh, dude, the greatest common multiple of 9 and 6 is 18. It's like the cool kid at the math party that both 9 and 6 can hang out with without any drama. So, yeah, 18 is where it's at when it comes to those two numbers getting along in the world of multiples.
The common multiple of 4, 9, and 18 is 36.
As 18 = 9 x 2 then 18 is a multiple of 9 so the Least Common Multiple is 18!
90 is the least common multiple of 5, 9, 18, and 3.
The Greatest Common Factor (GCF) of 144, 45, and 18 is 9.