The GCF is: 1
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The greatest common factor of 7 and 28 is 7.
The greatest common factor of 21 and 77 is 7.
The greatest common factor of 18 , 7 = 1
1 is the greatest common factor of 7 and 8. There are no others.
The greatest common factor of the numbers 55, 77 and 143 is 11.Common factors of 55: 1, 5, 11, and 55.Common factors of 77: 1, 7, 11, and 77.Common factors of 143: 1, 11, 13, and 143.So the greatest common factor is 11.