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

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A prime number is a number that is only divisible by itself and one. Two is the smallest prime number, and others include 3, 5, 7, 11, 13, 17, 23, etc. A number that is not prime is called composite. We can write a composite number in its prime factorization by creating a factor tree. We can use factor trees to find the greatest common factor between two values, as well.

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