
When you ask "What number is halfway between 30 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=30 and Y=503.

To find the number halfway between 30 and 503, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 503 into our formula, we get:
(30 + 503)/2 = 266.5
Thus, the number halfway between 30 and 503 is 266.5.
To check that our answer is correct, we subtract 30 from 266.5 and subtract 266.5 from 503 and compare the two numbers:
266.5 - 30 = 236.5
503 - 266.5 = 236.5
As you can see, the halfway number is 236.5 higher than 30 and 236.5 lower than 503. Therefore, our halfway between answer of 266.5 above is correct.
Halfway Between
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Halfway Between 30 and 504
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