
When you ask "What number is halfway between 12 and 577?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=12 and Y=577.

To find the number halfway between 12 and 577, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 577 into our formula, we get:
(12 + 577)/2 = 294.5
Thus, the number halfway between 12 and 577 is 294.5.
To check that our answer is correct, we subtract 12 from 294.5 and subtract 294.5 from 577 and compare the two numbers:
294.5 - 12 = 282.5
577 - 294.5 = 282.5
As you can see, the halfway number is 282.5 higher than 12 and 282.5 lower than 577. Therefore, our halfway between answer of 294.5 above is correct.
Halfway Between
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Halfway Between 12 and 578
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