When you ask "What number is halfway between 85 and 715?" 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=715.
To find the number halfway between 85 and 715, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 715 into our formula, we get:
(85 + 715)/2 = 400
Thus, the number halfway between 85 and 715 is 400.
To check that our answer is correct, we subtract 85 from 400 and subtract 400 from 715 and compare the two numbers:
400 - 85 = 315
715 - 400 = 315
As you can see, the halfway number is 315 higher than 85 and 315 lower than 715. Therefore, our halfway between answer of 400 above is correct.
Halfway Between
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Halfway Between 85 and 716
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