When you ask "What number is halfway between 18 and 873?" 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=873.
To find the number halfway between 18 and 873, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 873 into our formula, we get:
(18 + 873)/2 = 445.5
Thus, the number halfway between 18 and 873 is 445.5.
To check that our answer is correct, we subtract 18 from 445.5 and subtract 445.5 from 873 and compare the two numbers:
445.5 - 18 = 427.5
873 - 445.5 = 427.5
As you can see, the halfway number is 427.5 higher than 18 and 427.5 lower than 873. Therefore, our halfway between answer of 445.5 above is correct.
Halfway Between
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Halfway Between 18 and 874
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