When you ask "What number is halfway between 15 and 816?" 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=816.
To find the number halfway between 15 and 816, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 816 into our formula, we get:
(15 + 816)/2 = 415.5
Thus, the number halfway between 15 and 816 is 415.5.
To check that our answer is correct, we subtract 15 from 415.5 and subtract 415.5 from 816 and compare the two numbers:
415.5 - 15 = 400.5
816 - 415.5 = 400.5
As you can see, the halfway number is 400.5 higher than 15 and 400.5 lower than 816. Therefore, our halfway between answer of 415.5 above is correct.
Halfway Between
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Halfway Between 15 and 817
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