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When you are finding common factors, one method is to list the factors.
In any list of distinct numbers, one will be greater than the others. In the list of common factors, one will be the greatest.
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Common factors of 18 and 30 are: 1, 2, 3, and 6.
-- 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.