When you ask "What number is halfway between 18 and 213?" 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=213.
To find the number halfway between 18 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 213 into our formula, we get:
(18 + 213)/2 = 115.5
Thus, the number halfway between 18 and 213 is 115.5.
To check that our answer is correct, we subtract 18 from 115.5 and subtract 115.5 from 213 and compare the two numbers:
115.5 - 18 = 97.5
213 - 115.5 = 97.5
As you can see, the halfway number is 97.5 higher than 18 and 97.5 lower than 213. Therefore, our halfway between answer of 115.5 above is correct.
Halfway Between
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Halfway Between 18 and 214
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