
When you ask "What number is halfway between 85 and 324?" 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=324.

To find the number halfway between 85 and 324, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 324 into our formula, we get:
(85 + 324)/2 = 204.5
Thus, the number halfway between 85 and 324 is 204.5.
To check that our answer is correct, we subtract 85 from 204.5 and subtract 204.5 from 324 and compare the two numbers:
204.5 - 85 = 119.5
324 - 204.5 = 119.5
As you can see, the halfway number is 119.5 higher than 85 and 119.5 lower than 324. Therefore, our halfway between answer of 204.5 above is correct.
Halfway Between
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Halfway Between 85 and 325
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