In math, a common factor usually refers to a factor that two or more numbers have in common. But, if you mean the most frequently occurring factor, that would be different. Since 1 divides every number, it would be the most common (frequently occurring) factor.
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3 is not a common factor of 5 and 10.
The GCF is the largest of the common factors.
The Greatest Common Factor (GCF) is: 1
Greatest Common Factor= 1
The lowest common factor is: 1