When you ask "What number is halfway between 78 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=78 and Y=315.
To find the number halfway between 78 and 315, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 78 and 315 into our formula, we get:
(78 + 315)/2 = 196.5
Thus, the number halfway between 78 and 315 is 196.5.
To check that our answer is correct, we subtract 78 from 196.5 and subtract 196.5 from 315 and compare the two numbers:
196.5 - 78 = 118.5
315 - 196.5 = 118.5
As you can see, the halfway number is 118.5 higher than 78 and 118.5 lower than 315. Therefore, our halfway between answer of 196.5 above is correct.
Halfway Between
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Halfway Between 78 and 316
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