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The least common multiple of 3, 4, 5, and 9 is 180.

The least common multiple (LCM) is often also called the lowest common multiple or smallest common multiple. Keep in mind that these different terms all refer to the same thing: the smallest positive integer which is a multiple of two or more numbers.

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7y ago
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13y ago

The least (or lowest) common factor of any two positive numbers will always be: 1

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11y ago

The LCM is 9.

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12y ago

18

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7y ago

It is: 9

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6y ago

It is 9

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5y ago

It is 9

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Q: What is the least common factor of 3 and 9?
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What is the least common factor of 9 and 15?

Most of the time, math questions are about the greatest common factor or the least common multiple, not the least common factor. The least common factor of any two numbers would typically be 1. The factors of 15 are 1, 3, 5, and 15. The factors of 9 are 1, 3, and 9. The greatest common factor is 3. The prime factors of 15 are 3 and 5. The prime factors of 9 are 3 and 3. So, take the 3 and 5 prime factors of 15, and then the second 3 prime factor of 9, multiply them together, so 3 x 5 x 3 = 45 is the least common multiple.