
When you ask "What number is halfway between 25 and 635?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=25 and Y=635.

To find the number halfway between 25 and 635, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 635 into our formula, we get:
(25 + 635)/2 = 330
Thus, the number halfway between 25 and 635 is 330.
To check that our answer is correct, we subtract 25 from 330 and subtract 330 from 635 and compare the two numbers:
330 - 25 = 305
635 - 330 = 305
As you can see, the halfway number is 305 higher than 25 and 305 lower than 635. Therefore, our halfway between answer of 330 above is correct.
Halfway Between
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Halfway Between 25 and 636
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