When you ask "What number is halfway between 30 and 511?" 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=511.
To find the number halfway between 30 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 511 into our formula, we get:
(30 + 511)/2 = 270.5
Thus, the number halfway between 30 and 511 is 270.5.
To check that our answer is correct, we subtract 30 from 270.5 and subtract 270.5 from 511 and compare the two numbers:
270.5 - 30 = 240.5
511 - 270.5 = 240.5
As you can see, the halfway number is 240.5 higher than 30 and 240.5 lower than 511. Therefore, our halfway between answer of 270.5 above is correct.
Halfway Between
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Halfway Between 30 and 512
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