When you ask "What number is halfway between 15 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=15 and Y=815.
To find the number halfway between 15 and 815, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 815 into our formula, we get:
(15 + 815)/2 = 415
Thus, the number halfway between 15 and 815 is 415.
To check that our answer is correct, we subtract 15 from 415 and subtract 415 from 815 and compare the two numbers:
415 - 15 = 400
815 - 415 = 400
As you can see, the halfway number is 400 higher than 15 and 400 lower than 815. Therefore, our halfway between answer of 415 above is correct.
Halfway Between
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Halfway Between 15 and 816
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