
When you ask "What number is halfway between 86 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=86 and Y=129.

To find the number halfway between 86 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 86 and 129 into our formula, we get:
(86 + 129)/2 = 107.5
Thus, the number halfway between 86 and 129 is 107.5.
To check that our answer is correct, we subtract 86 from 107.5 and subtract 107.5 from 129 and compare the two numbers:
107.5 - 86 = 21.5
129 - 107.5 = 21.5
As you can see, the halfway number is 21.5 higher than 86 and 21.5 lower than 129. Therefore, our halfway between answer of 107.5 above is correct.
Halfway Between
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Halfway Between 86 and 130
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