
When you ask "What number is halfway between 0 and 511?" 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=511.

To find the number halfway between 0 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 511 into our formula, we get:
(0 + 511)/2 = 255.5
Thus, the number halfway between 0 and 511 is 255.5.
To check that our answer is correct, we subtract 0 from 255.5 and subtract 255.5 from 511 and compare the two numbers:
255.5 - 0 = 255.5
511 - 255.5 = 255.5
As you can see, the halfway number is 255.5 higher than 0 and 255.5 lower than 511. Therefore, our halfway between answer of 255.5 above is correct.
Halfway Between
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Halfway Between 0 and 512
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