
When you ask "What number is halfway between 81 and 109?" 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=109.

To find the number halfway between 81 and 109, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 109 into our formula, we get:
(81 + 109)/2 = 95
Thus, the number halfway between 81 and 109 is 95.
To check that our answer is correct, we subtract 81 from 95 and subtract 95 from 109 and compare the two numbers:
95 - 81 = 14
109 - 95 = 14
As you can see, the halfway number is 14 higher than 81 and 14 lower than 109. Therefore, our halfway between answer of 95 above is correct.
Halfway Between
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Halfway Between 81 and 110
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