
When you ask "What number is halfway between 12 and 581?" 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=581.

To find the number halfway between 12 and 581, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 581 into our formula, we get:
(12 + 581)/2 = 296.5
Thus, the number halfway between 12 and 581 is 296.5.
To check that our answer is correct, we subtract 12 from 296.5 and subtract 296.5 from 581 and compare the two numbers:
296.5 - 12 = 284.5
581 - 296.5 = 284.5
As you can see, the halfway number is 284.5 higher than 12 and 284.5 lower than 581. Therefore, our halfway between answer of 296.5 above is correct.
Halfway Between
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Halfway Between 12 and 582
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