When you ask "What number is halfway between 31 and 508?" 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=508.
To find the number halfway between 31 and 508, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 508 into our formula, we get:
(31 + 508)/2 = 269.5
Thus, the number halfway between 31 and 508 is 269.5.
To check that our answer is correct, we subtract 31 from 269.5 and subtract 269.5 from 508 and compare the two numbers:
269.5 - 31 = 238.5
508 - 269.5 = 238.5
As you can see, the halfway number is 238.5 higher than 31 and 238.5 lower than 508. Therefore, our halfway between answer of 269.5 above is correct.
Halfway Between
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Halfway Between 31 and 509
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