Well, honey, the greatest common factor of 49, 21, and 28 is 7. It's like finding the one thing they all have in common, and in this case, that thing is 7. So, there you have it, the greatest common factor is 7.
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The GCF is 7.
The greatest common factor of 7 and 28 is 7.
The greatest common factor of 28 and 120 is 4.
The GCF is 7.
21 and 28.