Goal: Find the greatest common factor of two or more numbers.

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Presentation transcript:

Goal: Find the greatest common factor of two or more numbers.

 Factor: when two or more numbers are multiplied together  Common factor: A whole number that is a factor of two or more whole numbers.  Greatest common factor (GCF): is the largest of the common factors.

 You must list all the factors for each number  Then circle the biggest number they have in common

 4  6  8  12

 10  15  12  16

 42  56

 Find the prime factorization of each number.  Pair all the common prime factors.  Multiply to find GCF