1 and 11
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The factors of 77 are 1, 7, 11, 77. For them to be common, they need to be compared to another set of factors.
77 has four factors: 1, 7, 11, 77.
Factors of 77: 1, 7, 11, and 77.
Just look for common factors, and divide both numbers by that common factor.7 is a common factor, so 77/147 = 11/21.
77 is the only one. 7 and 11 are both prime numbers, which means they must also be relatively prime (no common factors), so their least common multiple is 77.