
When you ask "What number is halfway between 13 and 644?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=13 and Y=644.

To find the number halfway between 13 and 644, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 644 into our formula, we get:
(13 + 644)/2 = 328.5
Thus, the number halfway between 13 and 644 is 328.5.
To check that our answer is correct, we subtract 13 from 328.5 and subtract 328.5 from 644 and compare the two numbers:
328.5 - 13 = 315.5
644 - 328.5 = 315.5
As you can see, the halfway number is 315.5 higher than 13 and 315.5 lower than 644. Therefore, our halfway between answer of 328.5 above is correct.
Halfway Between
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Halfway Between 13 and 645
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