The GCF is 11.
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The GCF is 5.
The GCF is 5.
The greatest common factor of the numbers 55, 77 and 143 is 11.Common factors of 55: 1, 5, 11, and 55.Common factors of 77: 1, 7, 11, and 77.Common factors of 143: 1, 11, 13, and 143.So the greatest common factor is 11.
The factors of 55 are:1, 5, 11, 55The factors of 77 are:1, 7, 11, 77The common factors are:1, 11The Greatest Common Factor (GCF) is:11
There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.