Look at the prime factorisation of both numbers: 22 = 2 * 11 77 = 7 * 11 There is only one common factor and that is 11.
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The greatest common factor of 77 and 143 is 11.
The greatest common factor of 77 and 88 is 11, and it is also the greatest prime factor.
The greatest common factor of 77 and 121 is 11, so you can reduce the fraction 77/121 by dividing both the numerator and denominator by 11 to get 7/11.
The GCF is 77.
(77/84) is the simplest form.You probably want the "lowest terms".That's (11/12).