When you ask "What number is halfway between 28 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=28 and Y=317.
To find the number halfway between 28 and 317, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 28 and 317 into our formula, we get:
(28 + 317)/2 = 172.5
Thus, the number halfway between 28 and 317 is 172.5.
To check that our answer is correct, we subtract 28 from 172.5 and subtract 172.5 from 317 and compare the two numbers:
172.5 - 28 = 144.5
317 - 172.5 = 144.5
As you can see, the halfway number is 144.5 higher than 28 and 144.5 lower than 317. Therefore, our halfway between answer of 172.5 above is correct.
Halfway Between
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Halfway Between 28 and 318
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