The common factors of 660 and 770 are: 1, 2, 5, 10, 11, 22, 55, and 110
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770, 1540, 2310, 3080, 3850 . . .
The LCM is 770.
110; 220; 330; 440; 550; 660; 770; 880; 990 and so on.The least common multiple of 10 and 11 is 110. So every multiple of 110 will also be a common multiple of both 10 and 11 (but just not the least common multiple).
2 x 5 x 7 x 11 = 770
LCM(11, 70, 35) = 770