
When you ask "What number is halfway between 0 and 503?" 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=503.

To find the number halfway between 0 and 503, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 503 into our formula, we get:
(0 + 503)/2 = 251.5
Thus, the number halfway between 0 and 503 is 251.5.
To check that our answer is correct, we subtract 0 from 251.5 and subtract 251.5 from 503 and compare the two numbers:
251.5 - 0 = 251.5
503 - 251.5 = 251.5
As you can see, the halfway number is 251.5 higher than 0 and 251.5 lower than 503. Therefore, our halfway between answer of 251.5 above is correct.
Halfway Between
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Halfway Between 0 and 504
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