When you ask "What number is halfway between 18 and 855?" 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=855.
To find the number halfway between 18 and 855, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 855 into our formula, we get:
(18 + 855)/2 = 436.5
Thus, the number halfway between 18 and 855 is 436.5.
To check that our answer is correct, we subtract 18 from 436.5 and subtract 436.5 from 855 and compare the two numbers:
436.5 - 18 = 418.5
855 - 436.5 = 418.5
As you can see, the halfway number is 418.5 higher than 18 and 418.5 lower than 855. Therefore, our halfway between answer of 436.5 above is correct.
Halfway Between
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Halfway Between 18 and 856
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