* The prime factors of 55 are 5 and 11. * The prime factors of 155 are 5 and 31. Therefore the only common factor betwen them is 5. So it is also the highest.
5.
The GCF is 5.
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The greatest common factor of 15 and 55 is 5.
The greatest common factor of 55 and 88 is 11.
The greatest common factor of 30,40, and 55 is 5.
The greatest common factor of 30 55 and 175 is 5.
The greatest common factor of 55 and 99 is 11.The GCF of 55 and 99 is 11.