When you ask "What number is halfway between 31 and 113?" 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=113.
To find the number halfway between 31 and 113, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 113 into our formula, we get:
(31 + 113)/2 = 72
Thus, the number halfway between 31 and 113 is 72.
To check that our answer is correct, we subtract 31 from 72 and subtract 72 from 113 and compare the two numbers:
72 - 31 = 41
113 - 72 = 41
As you can see, the halfway number is 41 higher than 31 and 41 lower than 113. Therefore, our halfway between answer of 72 above is correct.
Halfway Between
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Halfway Between 31 and 114
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