
When you ask "What number is halfway between 25 and 691?" 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=691.

To find the number halfway between 25 and 691, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 691 into our formula, we get:
(25 + 691)/2 = 358
Thus, the number halfway between 25 and 691 is 358.
To check that our answer is correct, we subtract 25 from 358 and subtract 358 from 691 and compare the two numbers:
358 - 25 = 333
691 - 358 = 333
As you can see, the halfway number is 333 higher than 25 and 333 lower than 691. Therefore, our halfway between answer of 358 above is correct.
Halfway Between
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Halfway Between 25 and 692
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