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The least common factor of two whole numbers is always ' 1 '. This is a big part

of the reason why you'll never be asked to find it.

To find the greatest common factor:

-- List all the factors of the first number.

-- List all the factors of the second number.

-- Create another list, with all of the factors that are on both of the first two lists.

-- The greatest number on the new list is the greatest common factor of the two original numbers.

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Q: How do you find a least common factor and the greatest common factor?

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You need at least two numbers to find a GCF. There cannot be a greatest common factor if there are not at least two numbers to compare. The greatest common factor is the largest factor that all the numbers have in common - the largest factor that they all share.

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