What is the least common factor of 9 and 20?

To answer the question, "What is the least common factor of 9 and 20?", we will start by defining and listing factors of 9 and 20.

Factors of 9 are all the integers that when multiplied by another integer equal 9. Likewise, factors of 20 are all the integers that when multiplied by another integer equal 20.

The factors of 9 are 1, 3, and 9.

The factors 20 are 1, 2, 4, 5, 10, and 20.

When you ask, "What is the least common factor of 9 and 20?", least is the key word here. Least means smallest. Thus, the smallest or least common factor that 9 and 20 have in common is 1.

Note that all integers, such as 9 and 20, have 1 as one of its factors. Thus, the answer to the least common factor of any two integers greater than 0 will always be 1.

Now that you know the least common factor of 9 and 20, you may also be interested in knowing the greatest common factor of 9 and 20. The greatest factor 9 and 20 have in common, per the list above, is 1.

When you asked for the least common factor of 9 and 20, did you mean least common multiple? If so, the least common multiple of 9 and 20 is 180.

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