When you ask "What number is halfway between 11 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=11 and Y=511.
To find the number halfway between 11 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 511 into our formula, we get:
(11 + 511)/2 = 261
Thus, the number halfway between 11 and 511 is 261.
To check that our answer is correct, we subtract 11 from 261 and subtract 261 from 511 and compare the two numbers:
261 - 11 = 250
511 - 261 = 250
As you can see, the halfway number is 250 higher than 11 and 250 lower than 511. Therefore, our halfway between answer of 261 above is correct.
Halfway Between
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Halfway Between 11 and 512
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