When you ask "What number is halfway between 3 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=3 and Y=558.
To find the number halfway between 3 and 558, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 558 into our formula, we get:
(3 + 558)/2 = 280.5
Thus, the number halfway between 3 and 558 is 280.5.
To check that our answer is correct, we subtract 3 from 280.5 and subtract 280.5 from 558 and compare the two numbers:
280.5 - 3 = 277.5
558 - 280.5 = 277.5
As you can see, the halfway number is 277.5 higher than 3 and 277.5 lower than 558. Therefore, our halfway between answer of 280.5 above is correct.
Halfway Between
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Halfway Between 3 and 559
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