What us the greatest common factor of 55 and 77

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

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.

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