When you ask "What number is halfway between 85 and 512?" 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=512.
To find the number halfway between 85 and 512, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 512 into our formula, we get:
(85 + 512)/2 = 298.5
Thus, the number halfway between 85 and 512 is 298.5.
To check that our answer is correct, we subtract 85 from 298.5 and subtract 298.5 from 512 and compare the two numbers:
298.5 - 85 = 213.5
512 - 298.5 = 213.5
As you can see, the halfway number is 213.5 higher than 85 and 213.5 lower than 512. Therefore, our halfway between answer of 298.5 above is correct.
Halfway Between
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Halfway Between 85 and 513
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