When you ask "What number is halfway between 18 and 817?" 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=817.
To find the number halfway between 18 and 817, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 817 into our formula, we get:
(18 + 817)/2 = 417.5
Thus, the number halfway between 18 and 817 is 417.5.
To check that our answer is correct, we subtract 18 from 417.5 and subtract 417.5 from 817 and compare the two numbers:
417.5 - 18 = 399.5
817 - 417.5 = 399.5
As you can see, the halfway number is 399.5 higher than 18 and 399.5 lower than 817. Therefore, our halfway between answer of 417.5 above is correct.
Halfway Between
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Halfway Between 18 and 818
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