
When you ask "What number is halfway between 85 and 516?" 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=516.

To find the number halfway between 85 and 516, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 516 into our formula, we get:
(85 + 516)/2 = 300.5
Thus, the number halfway between 85 and 516 is 300.5.
To check that our answer is correct, we subtract 85 from 300.5 and subtract 300.5 from 516 and compare the two numbers:
300.5 - 85 = 215.5
516 - 300.5 = 215.5
As you can see, the halfway number is 215.5 higher than 85 and 215.5 lower than 516. Therefore, our halfway between answer of 300.5 above is correct.
Halfway Between
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Halfway Between 85 and 517
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