
When you ask "What number is halfway between 31 and 50?" 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=50.

To find the number halfway between 31 and 50, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 50 into our formula, we get:
(31 + 50)/2 = 40.5
Thus, the number halfway between 31 and 50 is 40.5.
To check that our answer is correct, we subtract 31 from 40.5 and subtract 40.5 from 50 and compare the two numbers:
40.5 - 31 = 9.5
50 - 40.5 = 9.5
As you can see, the halfway number is 9.5 higher than 31 and 9.5 lower than 50. Therefore, our halfway between answer of 40.5 above is correct.
Halfway Between
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