
When you ask "What number is halfway between 9 and 586?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=586.

To find the number halfway between 9 and 586, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 586 into our formula, we get:
(9 + 586)/2 = 297.5
Thus, the number halfway between 9 and 586 is 297.5.
To check that our answer is correct, we subtract 9 from 297.5 and subtract 297.5 from 586 and compare the two numbers:
297.5 - 9 = 288.5
586 - 297.5 = 288.5
As you can see, the halfway number is 288.5 higher than 9 and 288.5 lower than 586. Therefore, our halfway between answer of 297.5 above is correct.
Halfway Between
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