When you ask "What number is halfway between 7 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=7 and Y=511.
To find the number halfway between 7 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 7 and 511 into our formula, we get:
(7 + 511)/2 = 259
Thus, the number halfway between 7 and 511 is 259.
To check that our answer is correct, we subtract 7 from 259 and subtract 259 from 511 and compare the two numbers:
259 - 7 = 252
511 - 259 = 252
As you can see, the halfway number is 252 higher than 7 and 252 lower than 511. Therefore, our halfway between answer of 259 above is correct.
Halfway Between
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Halfway Between 7 and 512
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