When you ask "What number is halfway between 7 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=7 and Y=18.
To find the number halfway between 7 and 18, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 18 into our formula, we get:
(7 + 18)/2 = 12.5
Thus, the number halfway between 7 and 18 is 12.5.
To check that our answer is correct, we subtract 7 from 12.5 and subtract 12.5 from 18 and compare the two numbers:
12.5 - 7 = 5.5
18 - 12.5 = 5.5
As you can see, the halfway number is 5.5 higher than 7 and 5.5 lower than 18. Therefore, our halfway between answer of 12.5 above is correct.
Halfway Between
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