When you ask "What number is halfway between 31 and 518?" 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=518.
To find the number halfway between 31 and 518, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 518 into our formula, we get:
(31 + 518)/2 = 274.5
Thus, the number halfway between 31 and 518 is 274.5.
To check that our answer is correct, we subtract 31 from 274.5 and subtract 274.5 from 518 and compare the two numbers:
274.5 - 31 = 243.5
518 - 274.5 = 243.5
As you can see, the halfway number is 243.5 higher than 31 and 243.5 lower than 518. Therefore, our halfway between answer of 274.5 above is correct.
Halfway Between
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Halfway Between 31 and 519
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