Factors of 4: 1, 2, 4
Factors of 10: 1, 2, 5, 10
Factors of 16: 1, 2, 4, 8, 16
GCF (4, 10, 16) = 2
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The greatest common factor for 16 and 38 is 2.
The greatest common factor of 16 and 34 is 2.
The greatest common factor for 15 and 16 is 1.
The greatest common factor of 16 and 28 is 4
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.