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You need at least two numbers to find a GCF.
The GCF is 2.
10 = 2 x 5 25 = 5 x 5 The only factor the two numbers have in common is 5. Then that must be the greatest common factor.
1
4
14
7
2
It is: 3
It is: 4
It is: 8
The GCF is 16.