When you ask "What number is halfway between 15 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=15 and Y=638.
To find the number halfway between 15 and 638, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 638 into our formula, we get:
(15 + 638)/2 = 326.5
Thus, the number halfway between 15 and 638 is 326.5.
To check that our answer is correct, we subtract 15 from 326.5 and subtract 326.5 from 638 and compare the two numbers:
326.5 - 15 = 311.5
638 - 326.5 = 311.5
As you can see, the halfway number is 311.5 higher than 15 and 311.5 lower than 638. Therefore, our halfway between answer of 326.5 above is correct.
Halfway Between
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Halfway Between 15 and 639
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