When you ask "What number is halfway between 18 and 818?" 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=818.
To find the number halfway between 18 and 818, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 818 into our formula, we get:
(18 + 818)/2 = 418
Thus, the number halfway between 18 and 818 is 418.
To check that our answer is correct, we subtract 18 from 418 and subtract 418 from 818 and compare the two numbers:
418 - 18 = 400
818 - 418 = 400
As you can see, the halfway number is 400 higher than 18 and 400 lower than 818. Therefore, our halfway between answer of 418 above is correct.
Halfway Between
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Halfway Between 18 and 819
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