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Greatest Common Factors - Problem 4

Teacher/Instructor Alissa Fong
Alissa Fong

MA, Stanford University
Teaching in the San Francisco Bay Area

Alissa is currently a teacher in the San Francisco Bay Area and Brightstorm users love her clear, concise explanations of tough concepts

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.

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