25 factors to [5 5]
35 factors to [5 7]
common factors: [5]
5 is the answer.◄
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The GCF is 5.
5
The greatest common factor of 18 and 55 is 1.
The greatest common factor of the numbers 132 and 55 is 11.
Since 55 is a factor of 110, it is automatically the GCF.