
When you ask "What number is halfway between 85 and 897?" 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=897.

To find the number halfway between 85 and 897, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 897 into our formula, we get:
(85 + 897)/2 = 491
Thus, the number halfway between 85 and 897 is 491.
To check that our answer is correct, we subtract 85 from 491 and subtract 491 from 897 and compare the two numbers:
491 - 85 = 406
897 - 491 = 406
As you can see, the halfway number is 406 higher than 85 and 406 lower than 897. Therefore, our halfway between answer of 491 above is correct.
Halfway Between
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Halfway Between 85 and 898
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