When you ask "What number is halfway between 18 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=18 and Y=585.
To find the number halfway between 18 and 585, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 585 into our formula, we get:
(18 + 585)/2 = 301.5
Thus, the number halfway between 18 and 585 is 301.5.
To check that our answer is correct, we subtract 18 from 301.5 and subtract 301.5 from 585 and compare the two numbers:
301.5 - 18 = 283.5
585 - 301.5 = 283.5
As you can see, the halfway number is 283.5 higher than 18 and 283.5 lower than 585. Therefore, our halfway between answer of 301.5 above is correct.
Halfway Between
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Halfway Between 18 and 586
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