
When you ask "What number is halfway between 39 and 259?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=39 and Y=259.

To find the number halfway between 39 and 259, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 39 and 259 into our formula, we get:
(39 + 259)/2 = 149
Thus, the number halfway between 39 and 259 is 149.
To check that our answer is correct, we subtract 39 from 149 and subtract 149 from 259 and compare the two numbers:
149 - 39 = 110
259 - 149 = 110
As you can see, the halfway number is 110 higher than 39 and 110 lower than 259. Therefore, our halfway between answer of 149 above is correct.
Halfway Between
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Halfway Between 39 and 260
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