-- List all factors of the first number.
-- List all factors of the second number.
-- If there are more than two numbers, list all factors of each one.
-- Find the set of factors that are on every list.
-- Find the greatest factor in the set.
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the smaller number
What makes a greatest common factor "common" is comparing at least two terms and finding something common between them.
The Greatest Common Factor (GCF) is: 8
The greatest common factor is 2
The greatest common factor of 30 and 39 is 3.