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How do you know if the greatest common factor of two numbers is two just by looking at it?
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How do you know if the greatest common factor of two numbers is two just by looking at it?

User Chirag Chaudhari
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Well, you know just by looking at it because it ends in an even number. Like, the greatest common factor of 4 is 2, 1.) Because no other number can "go into it," and 2.) Because it's even.
User Michaelangelo
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