When you ask "What number is halfway between 18 and 857?" 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=857.
To find the number halfway between 18 and 857, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 857 into our formula, we get:
(18 + 857)/2 = 437.5
Thus, the number halfway between 18 and 857 is 437.5.
To check that our answer is correct, we subtract 18 from 437.5 and subtract 437.5 from 857 and compare the two numbers:
437.5 - 18 = 419.5
857 - 437.5 = 419.5
As you can see, the halfway number is 419.5 higher than 18 and 419.5 lower than 857. Therefore, our halfway between answer of 437.5 above is correct.
Halfway Between
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Halfway Between 18 and 858
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