1. The problem is to find the Greatest Common Factor (GCF) of 18 and 24. 2. The factors of 18 are correctly listed as $1, 2, 3, 6, 9, 18$. 3. The factors of 24 are correctly listed as $1, 2, 3, 4, 6, 8, 12, 24$ (note the missing 12 in your list). 4. The common factors of 18 and 24 are the numbers that appear in both lists: $1, 2, 3, 6$. 5. The number 8 is not a factor of 18, so it cannot be a common factor. 6. The Greatest Common Factor (GCF) is the largest number in the common factors list, which is $6$. 7. Therefore, the statement "GCF (18, 24) = 8" is incorrect because 8 is not a common factor of 18 and 24. 8. Correct GCF calculation: $$\text{GCF}(18, 24) = 6$$ This is why the original answer is wrong.