When you ask "What number is halfway between 31 and 118?" 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=118.
To find the number halfway between 31 and 118, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 31 and 118 into our formula, we get:
(31 + 118)/2 = 74.5
Thus, the number halfway between 31 and 118 is 74.5.
To check that our answer is correct, we subtract 31 from 74.5 and subtract 74.5 from 118 and compare the two numbers:
74.5 - 31 = 43.5
118 - 74.5 = 43.5
As you can see, the halfway number is 43.5 higher than 31 and 43.5 lower than 118. Therefore, our halfway between answer of 74.5 above is correct.
Halfway Between
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Halfway Between 31 and 119
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