
When you ask "What number is halfway between 100 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=100 and Y=589.

To find the number halfway between 100 and 589, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 589 into our formula, we get:
(100 + 589)/2 = 344.5
Thus, the number halfway between 100 and 589 is 344.5.
To check that our answer is correct, we subtract 100 from 344.5 and subtract 344.5 from 589 and compare the two numbers:
344.5 - 100 = 244.5
589 - 344.5 = 244.5
As you can see, the halfway number is 244.5 higher than 100 and 244.5 lower than 589. Therefore, our halfway between answer of 344.5 above is correct.
Halfway Between
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Halfway Between 100 and 590
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