When you ask "What number is halfway between 18 and 825?" 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=825.
To find the number halfway between 18 and 825, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 825 into our formula, we get:
(18 + 825)/2 = 421.5
Thus, the number halfway between 18 and 825 is 421.5.
To check that our answer is correct, we subtract 18 from 421.5 and subtract 421.5 from 825 and compare the two numbers:
421.5 - 18 = 403.5
825 - 421.5 = 403.5
As you can see, the halfway number is 403.5 higher than 18 and 403.5 lower than 825. Therefore, our halfway between answer of 421.5 above is correct.
Halfway Between
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Halfway Between 18 and 826
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