When you ask "What number is halfway between 15 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=15 and Y=558.
To find the number halfway between 15 and 558, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 558 into our formula, we get:
(15 + 558)/2 = 286.5
Thus, the number halfway between 15 and 558 is 286.5.
To check that our answer is correct, we subtract 15 from 286.5 and subtract 286.5 from 558 and compare the two numbers:
286.5 - 15 = 271.5
558 - 286.5 = 271.5
As you can see, the halfway number is 271.5 higher than 15 and 271.5 lower than 558. Therefore, our halfway between answer of 286.5 above is correct.
Halfway Between
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Halfway Between 15 and 559
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