# Greatest Common Factors - Problem 4

###### Explanation

Finding the greatest common factor of two integers means finding the largest number that multiplies into both of the numbers that you were given. One way to do this is to break both numbers into their "prime factorization" using a number tree. From there, circle any factors, or "leaves" that are the same in both trees. The product of those circled numbers will give you the greatest common factor.

###### Transcript

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