All I did was make a factor tree. The GCF (Greatest Common Factor) is 5. :)
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The GCF is 5.
The GCF is 35.
The GCF is 7.
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!
The factors of 35 are: 1, 5, 7, 35 The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40 The common factors are: 1, 5 The Greatest Common Factor (GCF) is: 5