
When you ask "What number is halfway between 0 and 643?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=0 and Y=643.

To find the number halfway between 0 and 643, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 643 into our formula, we get:
(0 + 643)/2 = 321.5
Thus, the number halfway between 0 and 643 is 321.5.
To check that our answer is correct, we subtract 0 from 321.5 and subtract 321.5 from 643 and compare the two numbers:
321.5 - 0 = 321.5
643 - 321.5 = 321.5
As you can see, the halfway number is 321.5 higher than 0 and 321.5 lower than 643. Therefore, our halfway between answer of 321.5 above is correct.
Halfway Between
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Halfway Between 0 and 644
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