When you ask "What number is halfway between 15 and 580?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=580.
To find the number halfway between 15 and 580, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 580 into our formula, we get:
(15 + 580)/2 = 297.5
Thus, the number halfway between 15 and 580 is 297.5.
To check that our answer is correct, we subtract 15 from 297.5 and subtract 297.5 from 580 and compare the two numbers:
297.5 - 15 = 282.5
580 - 297.5 = 282.5
As you can see, the halfway number is 282.5 higher than 15 and 282.5 lower than 580. Therefore, our halfway between answer of 297.5 above is correct.
Halfway Between
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Halfway Between 15 and 581
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