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5. Quick way to see this: 15=3*5. 55 is divisible by 5 but not 3, so the GCF is 5. More info at the links.
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The GCF is 5.
The GCF is 1
55 and 15's highest common factor is five.
The greatest common factor of 165 and 345 is 15.
The LCM is: 825The GCF is: 5
The GCF of 55 and 105 is 5.
gcf of 55 and 121
The GCF is 11.