
When you ask "What number is halfway between 85 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=85 and Y=213.

To find the number halfway between 85 and 213, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 213 into our formula, we get:
(85 + 213)/2 = 149
Thus, the number halfway between 85 and 213 is 149.
To check that our answer is correct, we subtract 85 from 149 and subtract 149 from 213 and compare the two numbers:
149 - 85 = 64
213 - 149 = 64
As you can see, the halfway number is 64 higher than 85 and 64 lower than 213. Therefore, our halfway between answer of 149 above is correct.
Halfway Between
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Halfway Between 85 and 214
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