When you ask "What number is halfway between 18 and 827?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=18 and Y=827.
To find the number halfway between 18 and 827, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 827 into our formula, we get:
(18 + 827)/2 = 422.5
Thus, the number halfway between 18 and 827 is 422.5.
To check that our answer is correct, we subtract 18 from 422.5 and subtract 422.5 from 827 and compare the two numbers:
422.5 - 18 = 404.5
827 - 422.5 = 404.5
As you can see, the halfway number is 404.5 higher than 18 and 404.5 lower than 827. Therefore, our halfway between answer of 422.5 above is correct.
Halfway Between
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Halfway Between 18 and 828
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