
When you ask "What number is halfway between 31 and 316?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=31 and Y=316.

To find the number halfway between 31 and 316, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 316 into our formula, we get:
(31 + 316)/2 = 173.5
Thus, the number halfway between 31 and 316 is 173.5.
To check that our answer is correct, we subtract 31 from 173.5 and subtract 173.5 from 316 and compare the two numbers:
173.5 - 31 = 142.5
316 - 173.5 = 142.5
As you can see, the halfway number is 142.5 higher than 31 and 142.5 lower than 316. Therefore, our halfway between answer of 173.5 above is correct.
Halfway Between
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Halfway Between 31 and 317
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