When you ask "What number is halfway between 84 and 317?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=317.
To find the number halfway between 84 and 317, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 317 into our formula, we get:
(84 + 317)/2 = 200.5
Thus, the number halfway between 84 and 317 is 200.5.
To check that our answer is correct, we subtract 84 from 200.5 and subtract 200.5 from 317 and compare the two numbers:
200.5 - 84 = 116.5
317 - 200.5 = 116.5
As you can see, the halfway number is 116.5 higher than 84 and 116.5 lower than 317. Therefore, our halfway between answer of 200.5 above is correct.
Halfway Between
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Halfway Between 84 and 318
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