When you ask "What number is halfway between 8 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=8 and Y=511.
To find the number halfway between 8 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 511 into our formula, we get:
(8 + 511)/2 = 259.5
Thus, the number halfway between 8 and 511 is 259.5.
To check that our answer is correct, we subtract 8 from 259.5 and subtract 259.5 from 511 and compare the two numbers:
259.5 - 8 = 251.5
511 - 259.5 = 251.5
As you can see, the halfway number is 251.5 higher than 8 and 251.5 lower than 511. Therefore, our halfway between answer of 259.5 above is correct.
Halfway Between
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Halfway Between 8 and 512
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