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A common factor is a number that is a factor of both (or all) the numbers in question. Therefore 55 would be a common factor of 110 and 165 because both of these numbers can be divided by 55.
However, a number by itself (and not in reference to other numbers) cannot be called a common factor. So 55 could be a common factor, but isn't necessarily always one.
Wiki User
∙ 2012-10-03 22:43:44
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What is the greatest common factor of 28 and 55?
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The Greatest Common Factor (GCF) of 55 and 90 is: 5
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