1 and 2
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The factors of 21 are 1,3,7, and 21. The factors of 70 are 1,2,5,7,14,35, and 70 The common factors of 21 and 70 are 1 and 7.
The common factors of 27 and 36 are 1, 3 and 9.
The common factors of 36 and 40 are 1,2 and 4.
The common factors of 36 and 99 are: 1, 3, 9
Oh honey, the greatest common factor of 15, 36, and 70 is 1. Those numbers don't have any common factors other than 1, so you're out of luck if you were hoping for something more exciting. But hey, at least now you know!