11/18 cannot be simplified - 11 is a prime number !
2 + 5 + 11 = 18 2 + 3 + 13 = 18
For a start, you can discard all the even numbers - those that end with 2, 4, 6, 8, 0 - except for the number 2 itself (which in this case, isn't in the list). This only leaves you with the number 11 - which happens to be a prime number.
7 & 11 added together total 18.
A prime number has only 2 factors which are 1 and itself. 11 and 7 equal 18 when added.
Lots of numbers are. To be relatively prime, they would have to have only the number 1 as a common factor. So any number that has any of 2, 3, 6, 9 or 18 as factors are not relative prime to 18. So numbers such as 5, 7, 11, 13 and 17 are relatively prime with 18.
The first prime number after 18 is 19.
A twin prime is a prime number that differs from another prime number by two. 18 is not a prime; it is a composite number. All even numbers are composites and 18 is an even number.
18 is not a prime number so no number can have 18 as a prime factor.
18 is a composite number because it has at least one positive factor other than one or itself.
2 is a prime number. 18 is a composite number.
11, 5, 2. two is a prime number. if you don't believe me, tell me what numbers other than itself and one go into i.