
When you ask "What number is halfway between 15 and 589?" 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=589.

To find the number halfway between 15 and 589, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 589 into our formula, we get:
(15 + 589)/2 = 302
Thus, the number halfway between 15 and 589 is 302.
To check that our answer is correct, we subtract 15 from 302 and subtract 302 from 589 and compare the two numbers:
302 - 15 = 287
589 - 302 = 287
As you can see, the halfway number is 287 higher than 15 and 287 lower than 589. Therefore, our halfway between answer of 302 above is correct.
Halfway Between
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Halfway Between 15 and 590
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