When you ask "What number is halfway between 25 and 638?" 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=638.
To find the number halfway between 25 and 638, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 25 and 638 into our formula, we get:
(25 + 638)/2 = 331.5
Thus, the number halfway between 25 and 638 is 331.5.
To check that our answer is correct, we subtract 25 from 331.5 and subtract 331.5 from 638 and compare the two numbers:
331.5 - 25 = 306.5
638 - 331.5 = 306.5
As you can see, the halfway number is 306.5 higher than 25 and 306.5 lower than 638. Therefore, our halfway between answer of 331.5 above is correct.
Halfway Between
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Halfway Between 25 and 639
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