When you ask "What number is halfway between 5 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=5 and Y=18.
To find the number halfway between 5 and 18, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 5 and 18 into our formula, we get:
(5 + 18)/2 = 11.5
Thus, the number halfway between 5 and 18 is 11.5.
To check that our answer is correct, we subtract 5 from 11.5 and subtract 11.5 from 18 and compare the two numbers:
11.5 - 5 = 6.5
18 - 11.5 = 6.5
As you can see, the halfway number is 6.5 higher than 5 and 6.5 lower than 18. Therefore, our halfway between answer of 11.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 5 and 19
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