When you ask "What number is halfway between 18 and 215?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=215.
To find the number halfway between 18 and 215, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 215 into our formula, we get:
(18 + 215)/2 = 116.5
Thus, the number halfway between 18 and 215 is 116.5.
To check that our answer is correct, we subtract 18 from 116.5 and subtract 116.5 from 215 and compare the two numbers:
116.5 - 18 = 98.5
215 - 116.5 = 98.5
As you can see, the halfway number is 98.5 higher than 18 and 98.5 lower than 215. Therefore, our halfway between answer of 116.5 above is correct.
Halfway Between
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