
When you ask "What number is halfway between 8 and 217?" 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=217.

To find the number halfway between 8 and 217, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 217 into our formula, we get:
(8 + 217)/2 = 112.5
Thus, the number halfway between 8 and 217 is 112.5.
To check that our answer is correct, we subtract 8 from 112.5 and subtract 112.5 from 217 and compare the two numbers:
112.5 - 8 = 104.5
217 - 112.5 = 104.5
As you can see, the halfway number is 104.5 higher than 8 and 104.5 lower than 217. Therefore, our halfway between answer of 112.5 above is correct.
Halfway Between
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Halfway Between 8 and 218
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