When you ask "What number is halfway between 17 and 558?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=17 and Y=558.
To find the number halfway between 17 and 558, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 17 and 558 into our formula, we get:
(17 + 558)/2 = 287.5
Thus, the number halfway between 17 and 558 is 287.5.
To check that our answer is correct, we subtract 17 from 287.5 and subtract 287.5 from 558 and compare the two numbers:
287.5 - 17 = 270.5
558 - 287.5 = 270.5
As you can see, the halfway number is 270.5 higher than 17 and 270.5 lower than 558. Therefore, our halfway between answer of 287.5 above is correct.
Halfway Between
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Halfway Between 17 and 559
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