What is the least common factor of 15 and 55?

To answer the question, "What is the least common factor of 15 and 55?", we will start by defining and listing factors of 15 and 55.

Factors of 15 are all the integers that when multiplied by another integer equal 15. Likewise, factors of 55 are all the integers that when multiplied by another integer equal 55.

The factors of 15 are 1, 3, 5, and 15.

The factors 55 are 1, 5, 11, and 55.

When you ask, "What is the least common factor of 15 and 55?", least is the key word here. Least means smallest. Thus, the smallest or least common factor that 15 and 55 have in common is 1.

Note that all integers, such as 15 and 55, 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 15 and 55, you may also be interested in knowing the greatest common factor of 15 and 55. The greatest factor 15 and 55 have in common, per the list above, is 5.

When you asked for the least common factor of 15 and 55, did you mean least common multiple? If so, the least common multiple of 15 and 55 is 165.

Least Common Factor Calculator
Need the least common factor for another set of numbers? Please submit your numbers here:

What is the least common factor of 15 and 56?
Go here for the next least common factor problem on our list.