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.
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The greatest common factor of 48 and 28 is 4.
The Greatest Common Factor of 28, 48 is 4.
8 is the greatest common factor for 48 and 40
The greatest common factor for 36 and 48 is 12.
The Greatest Common Factor of 39, 48, 51: 3