
When you ask "What number is halfway between 39 and 239?" 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=239.

To find the number halfway between 39 and 239, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 39 and 239 into our formula, we get:
(39 + 239)/2 = 139
Thus, the number halfway between 39 and 239 is 139.
To check that our answer is correct, we subtract 39 from 139 and subtract 139 from 239 and compare the two numbers:
139 - 39 = 100
239 - 139 = 100
As you can see, the halfway number is 100 higher than 39 and 100 lower than 239. Therefore, our halfway between answer of 139 above is correct.
Halfway Between
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Halfway Between 39 and 240
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