When you ask "What number is halfway between 3 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=3 and Y=511.
To find the number halfway between 3 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 511 into our formula, we get:
(3 + 511)/2 = 257
Thus, the number halfway between 3 and 511 is 257.
To check that our answer is correct, we subtract 3 from 257 and subtract 257 from 511 and compare the two numbers:
257 - 3 = 254
511 - 257 = 254
As you can see, the halfway number is 254 higher than 3 and 254 lower than 511. Therefore, our halfway between answer of 257 above is correct.
Halfway Between
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Halfway Between 3 and 512
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