Halfway Between 1 and 18

When you ask "What number is halfway between 1 and 18?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=1 and Y=18.

Halfway Between Line

To find the number halfway between 1 and 18, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 1 and 18 into our formula, we get:

(1 + 18)/2 = 9.5

Thus, the number halfway between 1 and 18 is 9.5.

To check that our answer is correct, we subtract 1 from 9.5 and subtract 9.5 from 18 and compare the two numbers:

9.5 - 1 = 8.5
18 - 9.5 = 8.5

As you can see, the halfway number is 8.5 higher than 1 and 8.5 lower than 18. Therefore, our halfway between answer of 9.5 above is correct.

Halfway Between
Find halfway between two other numbers here!

Halfway Between 1 and 19
Here is our next Halfway Between calculation.