When you ask "What number is halfway between 90 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=90 and Y=589.
To find the number halfway between 90 and 589, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 589 into our formula, we get:
(90 + 589)/2 = 339.5
Thus, the number halfway between 90 and 589 is 339.5.
To check that our answer is correct, we subtract 90 from 339.5 and subtract 339.5 from 589 and compare the two numbers:
339.5 - 90 = 249.5
589 - 339.5 = 249.5
As you can see, the halfway number is 249.5 higher than 90 and 249.5 lower than 589. Therefore, our halfway between answer of 339.5 above is correct.
Halfway Between
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Halfway Between 90 and 590
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