When you ask "What number is halfway between 9 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=9 and Y=511.
To find the number halfway between 9 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 511 into our formula, we get:
(9 + 511)/2 = 260
Thus, the number halfway between 9 and 511 is 260.
To check that our answer is correct, we subtract 9 from 260 and subtract 260 from 511 and compare the two numbers:
260 - 9 = 251
511 - 260 = 251
As you can see, the halfway number is 251 higher than 9 and 251 lower than 511. Therefore, our halfway between answer of 260 above is correct.
Halfway Between
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Halfway Between 9 and 512
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