When you ask "What number is halfway between 21 and 585?" 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=585.
To find the number halfway between 21 and 585, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 585 into our formula, we get:
(21 + 585)/2 = 303
Thus, the number halfway between 21 and 585 is 303.
To check that our answer is correct, we subtract 21 from 303 and subtract 303 from 585 and compare the two numbers:
303 - 21 = 282
585 - 303 = 282
As you can see, the halfway number is 282 higher than 21 and 282 lower than 585. Therefore, our halfway between answer of 303 above is correct.
Halfway Between
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Halfway Between 21 and 586
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