Greatest Common Factor (GCF) - the greatest common factor of two or more numbers is the largest factor they have in common.
To find the GCF of two numbers you can either use:
1. the listing method
2. the prime factorization method
The listing method:
list out the factors of each number and take the largest factor that they both share.
The prime factorization method:
Complete the prime factorization for each number. Multiply the pairs of prime factors that they both share together. Discard the prime factors that they do not both share. The product of the pairs of prime factors that they both share is the GCF.
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