When you ask "What number is halfway between 30 and 865?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=30 and Y=865.
To find the number halfway between 30 and 865, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 865 into our formula, we get:
(30 + 865)/2 = 447.5
Thus, the number halfway between 30 and 865 is 447.5.
To check that our answer is correct, we subtract 30 from 447.5 and subtract 447.5 from 865 and compare the two numbers:
447.5 - 30 = 417.5
865 - 447.5 = 417.5
As you can see, the halfway number is 417.5 higher than 30 and 417.5 lower than 865. Therefore, our halfway between answer of 447.5 above is correct.
Halfway Between
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Halfway Between 30 and 866
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