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No. Not "No, I won't explain how" but "No, 10 isn't a factor of 15 or 25."
Since 36 is a factor of 72, it is automatically the GCF.
Since 36 is a factor of 72, it is automatically the GCF.
I think you already did. Prime numbers have exactly two factors. 1 is not a prime number because it has only one factor.
Divide 7 into 291. If it comes out evenly, it's a factor. It doesn't, so it's not.