When you ask "What number is halfway between 30 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=30 and Y=317.
To find the number halfway between 30 and 317, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 317 into our formula, we get:
(30 + 317)/2 = 173.5
Thus, the number halfway between 30 and 317 is 173.5.
To check that our answer is correct, we subtract 30 from 173.5 and subtract 173.5 from 317 and compare the two numbers:
173.5 - 30 = 143.5
317 - 173.5 = 143.5
As you can see, the halfway number is 143.5 higher than 30 and 143.5 lower than 317. Therefore, our halfway between answer of 173.5 above is correct.
Halfway Between
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Halfway Between 30 and 318
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