When you ask "What number is halfway between 85 and 320?" 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=320.
To find the number halfway between 85 and 320, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 85 and 320 into our formula, we get:
(85 + 320)/2 = 202.5
Thus, the number halfway between 85 and 320 is 202.5.
To check that our answer is correct, we subtract 85 from 202.5 and subtract 202.5 from 320 and compare the two numbers:
202.5 - 85 = 117.5
320 - 202.5 = 117.5
As you can see, the halfway number is 117.5 higher than 85 and 117.5 lower than 320. Therefore, our halfway between answer of 202.5 above is correct.
Halfway Between
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Halfway Between 85 and 321
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