When you ask "What number is halfway between 10 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=10 and Y=213.
To find the number halfway between 10 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 213 into our formula, we get:
(10 + 213)/2 = 111.5
Thus, the number halfway between 10 and 213 is 111.5.
To check that our answer is correct, we subtract 10 from 111.5 and subtract 111.5 from 213 and compare the two numbers:
111.5 - 10 = 101.5
213 - 111.5 = 101.5
As you can see, the halfway number is 101.5 higher than 10 and 101.5 lower than 213. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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Halfway Between 10 and 214
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