The greatest common factor for 25 and 35 is '5'
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Find all the factors of each of the numbers. 25 - 1, 5, 25 35- 1, 5, 7, 35 The common factors are 1 and 5. The largest of these (5) is the GCF.
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 GCF of 42 and 35 is 7.factors of 42: 2,6,7factors of 35: 5,7