The GCF is 11.
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The greatest common factor of 77 and 143 is 11.
LCM: 5720 GCD: 11
17,303
The answer is 11. To find the Greatest Common Factor of a set of numbers, first find the prime factors of each number. 77 = 7 x 11 132 = 2 x 2 x 3 x 11 143 = 11 x 13 Then notice the factor(s) in common to every number, and multiply them together if there are more than one.
The idea here is to factor each of the numbers. Then look for common factors, i.e., factors that appear in both numbers.