Question 200291: What is the sum of the non-prime numbers of 12?
Answer by solver91311(24713)   (Show Source):
You can put this solution on YOUR website!
I have to presume you meant What is the sum of the non-prime factors of 12.
First, list and categorize all of the integers from 1 to 12 inclusive:
1, factor of 12 and not prime by definition
2, factor of 12 but prime
3, factor of 12 but prime
4, factor of 12 and not prime because divisible by 2
5, not a factor of 12
6, factor of 12 and not prime because divisible by 2 and 3
7, 8, 9, 10, and 11, not a factor of 12
12, a factor of 12 and not prime because divisible by 2 and 3
So the factors that fit the criteria are 1, 4, 6, and 12. Add 'em up.
John
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