When you ask "What number is halfway between 8 and 31?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=31.
To find the number halfway between 8 and 31, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 31 into our formula, we get:
(8 + 31)/2 = 19.5
Thus, the number halfway between 8 and 31 is 19.5.
To check that our answer is correct, we subtract 8 from 19.5 and subtract 19.5 from 31 and compare the two numbers:
19.5 - 8 = 11.5
31 - 19.5 = 11.5
As you can see, the halfway number is 11.5 higher than 8 and 11.5 lower than 31. Therefore, our halfway between answer of 19.5 above is correct.
Halfway Between
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