When you ask "What number is halfway between 66 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=66 and Y=585.
To find the number halfway between 66 and 585, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 66 and 585 into our formula, we get:
(66 + 585)/2 = 325.5
Thus, the number halfway between 66 and 585 is 325.5.
To check that our answer is correct, we subtract 66 from 325.5 and subtract 325.5 from 585 and compare the two numbers:
325.5 - 66 = 259.5
585 - 325.5 = 259.5
As you can see, the halfway number is 259.5 higher than 66 and 259.5 lower than 585. Therefore, our halfway between answer of 325.5 above is correct.
Halfway Between
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Halfway Between 66 and 586
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