When you ask "What number is halfway between 21 and 584?" 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=584.
To find the number halfway between 21 and 584, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 584 into our formula, we get:
(21 + 584)/2 = 302.5
Thus, the number halfway between 21 and 584 is 302.5.
To check that our answer is correct, we subtract 21 from 302.5 and subtract 302.5 from 584 and compare the two numbers:
302.5 - 21 = 281.5
584 - 302.5 = 281.5
As you can see, the halfway number is 281.5 higher than 21 and 281.5 lower than 584. Therefore, our halfway between answer of 302.5 above is correct.
Halfway Between
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Halfway Between 21 and 585
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