When you ask "What number is halfway between 18 and 871?" 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=871.
To find the number halfway between 18 and 871, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 871 into our formula, we get:
(18 + 871)/2 = 444.5
Thus, the number halfway between 18 and 871 is 444.5.
To check that our answer is correct, we subtract 18 from 444.5 and subtract 444.5 from 871 and compare the two numbers:
444.5 - 18 = 426.5
871 - 444.5 = 426.5
As you can see, the halfway number is 426.5 higher than 18 and 426.5 lower than 871. Therefore, our halfway between answer of 444.5 above is correct.
Halfway Between
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Halfway Between 18 and 872
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