
When you ask "What number is halfway between 13 and 645?" 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=645.

To find the number halfway between 13 and 645, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 13 and 645 into our formula, we get:
(13 + 645)/2 = 329
Thus, the number halfway between 13 and 645 is 329.
To check that our answer is correct, we subtract 13 from 329 and subtract 329 from 645 and compare the two numbers:
329 - 13 = 316
645 - 329 = 316
As you can see, the halfway number is 316 higher than 13 and 316 lower than 645. Therefore, our halfway between answer of 329 above is correct.
Halfway Between
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Halfway Between 13 and 646
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