When you ask "What number is halfway between 21 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=21 and Y=558.
To find the number halfway between 21 and 558, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 558 into our formula, we get:
(21 + 558)/2 = 289.5
Thus, the number halfway between 21 and 558 is 289.5.
To check that our answer is correct, we subtract 21 from 289.5 and subtract 289.5 from 558 and compare the two numbers:
289.5 - 21 = 268.5
558 - 289.5 = 268.5
As you can see, the halfway number is 268.5 higher than 21 and 268.5 lower than 558. Therefore, our halfway between answer of 289.5 above is correct.
Halfway Between
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Halfway Between 21 and 559
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