1, 2, 3, 5, 6, 10, 15, and 30.
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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.
1 2 3 5 6 10 15 30.
When you are finding common factors, one method is to list the factors.
All of them. Different numbers have different numbers of factors.