The only common factor is 1.
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Greatest common factor of 77 and 121 is 11.
The factors of 77 are 1, 7, 11, 77. For them to be common, they need to be compared to another set of factors.
Just look for common factors, and divide both numbers by that common factor.7 is a common factor, so 77/147 = 11/21.
The least common factor of any set of positive integers is 1.
Express each number in terms of its prime factors. 77 = 7 x 11 259 = 7 x 37 The only common factor and therefore the highest common factor is 7.