When you ask "What number is halfway between 12 and 815?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=12 and Y=815.
To find the number halfway between 12 and 815, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 815 into our formula, we get:
(12 + 815)/2 = 413.5
Thus, the number halfway between 12 and 815 is 413.5.
To check that our answer is correct, we subtract 12 from 413.5 and subtract 413.5 from 815 and compare the two numbers:
413.5 - 12 = 401.5
815 - 413.5 = 401.5
As you can see, the halfway number is 401.5 higher than 12 and 401.5 lower than 815. Therefore, our halfway between answer of 413.5 above is correct.
Halfway Between
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Halfway Between 12 and 816
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