All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. When put in a list, the largest of these is known as the greatest common factor, or GCF. Some people refer to this as the highest common factor, or HCF. Calling it the most common factor would be confusing, since people tend to think of "most common" as something that happens frequently.
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Since 5 is a factor of 10, all of its factors are common.
The common factors are 1 and 3. The greatest of these is 3.
What are the common factors for 14 and 22
The highest common factor is 5
Factors of 20:1,2,4,5,10,20Factors of 65:1,5,13,65The common factors are 1 and 5.