GCF(20, 25, 35, 40) = 5
The GCF of any set of numbers is also a factor of the difference of any pair of them. So the GCF must be a factor of 5 (= 25-20). This narrows down the options quite considerably!
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The GCF is 5.
25
5 is the GCF (greatest common factor)
25 is the greatest common factor. 5 is the greatest prime factor.
It's 25. Because 25 is the greatest and divides evenly into both of the numbers.