When you ask "What number is halfway between 25 and 688?" 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=688.
To find the number halfway between 25 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 688 into our formula, we get:
(25 + 688)/2 = 356.5
Thus, the number halfway between 25 and 688 is 356.5.
To check that our answer is correct, we subtract 25 from 356.5 and subtract 356.5 from 688 and compare the two numbers:
356.5 - 25 = 331.5
688 - 356.5 = 331.5
As you can see, the halfway number is 331.5 higher than 25 and 331.5 lower than 688. Therefore, our halfway between answer of 356.5 above is correct.
Halfway Between
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