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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Multiples are numbers greater than or equal to the number that the number will divide. So the multiples are: 5: 5, 10, 15, 20, 25, 30, 35, 40 8: 8, 16, 24, 32, 40 So now we can see that 40 is the least common multiple of 5 and 8. Hope this helps.
The least common multiple of 4, 5, and 8 is 40.
The least common multiple of 7, 8 and 10 is 280 The greatest common factor of 7, 8 and 10 is 1
The greatest common multiple of any set of integers is infinite.
The Greatest Common Factor (GCF) of 8, 40, and 54 is 6.