When you ask "What number is halfway between 81 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=81 and Y=118.
To find the number halfway between 81 and 118, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 118 into our formula, we get:
(81 + 118)/2 = 99.5
Thus, the number halfway between 81 and 118 is 99.5.
To check that our answer is correct, we subtract 81 from 99.5 and subtract 99.5 from 118 and compare the two numbers:
99.5 - 81 = 18.5
118 - 99.5 = 18.5
As you can see, the halfway number is 18.5 higher than 81 and 18.5 lower than 118. Therefore, our halfway between answer of 99.5 above is correct.
Halfway Between
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Halfway Between 81 and 119
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