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The least common multiple of 9 and 18 is 18. Because 18 is a multiple of 9, it is automatically the LCM.
You can also find the LCM of a pair of numbers by dividing their product by their GCF.
The product of 9 and 18 is 162.
The GCF of 9 and 18 is 9. (Because 9 is a factor of 18, it is automatically the greatest common factor of the pair.)
So the least common multiple of 9 and 18 is 162/9 = 18.
Another strategy for finding the LCM is listing the multiples of each number, then finding the lowest multiple that is in both lists.
The multiples of 9 are 9, 18, 27, and so on.
The multiples of 18 are 18, 36, 54, and so on.
So the LCM of 9 and 18 is 18.
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∙ 7y ago
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