They are 1 and 3
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The factors of 51 are 3 and 17. The factors of 11 are 3 and 37. Therefore, the highest common factor is 3.
The common factors of 21 and 51 are: 1 and 3
The common factors of 51 and 68 are: 1 and 17
The common factors of 51 and 85 are: 1 and 17.
Well, well, well, look who's trying to flex their math muscles. The highest common factor of 51 and 111 is 3. So there you have it, honey, 3 is the magic number that can divide both 51 and 111 without leaving a pesky remainder. Math problem solved, next!