Question

what us the greatest common factor of 55 and 77

Answer 1

$55|5\\11|\fbox{11}\\.\ 1|\\----------\\77|7\\11|\fbox{11}\\.\ 1|\\-----------\\\\\boxed{GCF(55;\ 77)=11}$

Answer 2

The factors of 55 are 1, 5, 11, and 55 .

The factors of 77 are 1, 7, 11, and 77 .

The common factors of  55  and  77 are 1  and 11 .

The greatest one is  11 .