When you ask "What number is halfway between 8 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=8 and Y=215.
To find the number halfway between 8 and 215, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 215 into our formula, we get:
(8 + 215)/2 = 111.5
Thus, the number halfway between 8 and 215 is 111.5.
To check that our answer is correct, we subtract 8 from 111.5 and subtract 111.5 from 215 and compare the two numbers:
111.5 - 8 = 103.5
215 - 111.5 = 103.5
As you can see, the halfway number is 103.5 higher than 8 and 103.5 lower than 215. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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