Question

What’s the greatest common factor of 65 and 55

Answer 1

5

Explanation:

Since we are asked to find the greatest common factor, our best choice would first be to find the prime factorization of
`$65$` and
`$55$`.

`$65 = 5\cdot13.$`

`$55 = 5\cdot11$`

From this, we can conclude that the greatest common factor is
`\boxed{5}`.

Answer 2

We found the factors and prime factorization of 55 and 65. The biggest common factor number is the GCF number. So the greatest common factor 55 and 65 is 5.