There is really no such thing as a "highest 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 highest multiple.
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The least common multiple of the numbers 15, 9 and 6 is 90.
The least common multiple of 6, 9, 10 and 15 is 90
210The LCM of 6, 12, and 21 is 210
it is 3030.The greatest common multiple of any set of integers is infinite.
There is no (Greatest Common Multiple) as this would be infinity.You can have Lowest Common Multiple (18 in this case), orGreatest Common Factor (6 in this case).