The GCF is 11.
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It is: 11
The GCF is 11.
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.
The greatest common factor of 21 and 77 is 7.
The greatest common factor of 22 , 66 , 77 = 11