# Part 3iii: Greatest Common Factor

### Oops!

You may have noticed a couple of errors in the previous clip. One was small, the other, not so much!

**Error #1**: When writing out the prime factorizations of and , I mentioned that “we can list all divisors of from the prime factorization”. This is almost true, but not quite, as is a divisor of but is not a prime factor of . I should have said “we can list all divisors of (except ) from the prime factorization”.

**Error #2**: You all probably caught this one; when computing I forgot a common factor of ; so is not 12, as I falsely stated, but instead is .