The common factors are 1, 2, 3, 6
The greatest common factor is six.
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The greatest common factor of 54 and 80 is 2.
18
42 - 1,2,3,6,7,42 54 - 1,2,3,6,9,54
The greatest common factor of 21 and 54 is 3. The greatest common factor is the highest number that divides exactly into two or more numbers. factors of 21: 1, 3, 7, 21 factors of 54: 1, 2, 3, 6, 9, 18, 27, 54 The greatest common factor of 21 and 54 is 3.
The GCF is 2.