
When you ask "What number is halfway between 27 and 129?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=27 and Y=129.

To find the number halfway between 27 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 27 and 129 into our formula, we get:
(27 + 129)/2 = 78
Thus, the number halfway between 27 and 129 is 78.
To check that our answer is correct, we subtract 27 from 78 and subtract 78 from 129 and compare the two numbers:
78 - 27 = 51
129 - 78 = 51
As you can see, the halfway number is 51 higher than 27 and 51 lower than 129. Therefore, our halfway between answer of 78 above is correct.
Halfway Between
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Halfway Between 27 and 130
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