When you ask "What number is halfway between 100 and 315?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=100 and Y=315.
To find the number halfway between 100 and 315, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 315 into our formula, we get:
(100 + 315)/2 = 207.5
Thus, the number halfway between 100 and 315 is 207.5.
To check that our answer is correct, we subtract 100 from 207.5 and subtract 207.5 from 315 and compare the two numbers:
207.5 - 100 = 107.5
315 - 207.5 = 107.5
As you can see, the halfway number is 107.5 higher than 100 and 107.5 lower than 315. Therefore, our halfway between answer of 207.5 above is correct.
Halfway Between
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Halfway Between 100 and 316
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