8
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The factors of 48 are 1, 2, 3, 4, 6, 8, 12, 16, 24, and 48. The factors of 104 are 1, 2, 4, 8, 13, 26, 52, and 104. The largest factor they have in common is 8, so 8 is the greatest common factor. You can also determine the greatest common factor by their prime factors. The prime factors of 48 are 2, 2, 2, 2, and 3. The prime factors of 104 are 2, 2, 2, and 13. The prime factors they have in common are 2, 2, and 2, so the greatest common factor is 2 x 2 x 2 = 8.
Since 16 is a factor of 32, it is automatically the GCF.
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.
No. 12 is.16 isn't even a factor of 60.
16