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If a number is added to itself, it is twice that number

→ 18 ÷ 2 = 9

→ 9 + 9 = 18

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It is 9 + 9 = 18

Q: What number added itself to make 18?

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A number x added to 18 would be written x + 18. The value* of x + 18 would depend on the value x. For example, if x was 2, x + 18 would equal 20. if x was 10, x + 18 would equal 28, and so on. *'Value' means what actual number it comes to.

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A Prime number has only 2 factors which are 1 and itself. 11 and 7 equal 18 when added.

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.

9 x represents a number so in this equation it basically means what number is added to 9 to make 18 to work it out you do 18-9=9

18. All numbers' highest factor is the number itself.

4.242640687It's the square root of 18

18

no, it not because it does not have a product of itself

It is simply: x+18 or 18+x

18 is a composite number because a prime number can only be multiplied by 1 and itself. 18 can be multiplied by 9 and 2 also.

The lowest multiple of any number is the number itself.

2 x 9 = 18, so 18 has more factors than 1 and itself. It cannot be prime because a prime number has two factors: 1 and itself.

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