When you ask "What number is halfway between 4 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=4 and Y=511.
To find the number halfway between 4 and 511, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 511 into our formula, we get:
(4 + 511)/2 = 257.5
Thus, the number halfway between 4 and 511 is 257.5.
To check that our answer is correct, we subtract 4 from 257.5 and subtract 257.5 from 511 and compare the two numbers:
257.5 - 4 = 253.5
511 - 257.5 = 253.5
As you can see, the halfway number is 253.5 higher than 4 and 253.5 lower than 511. Therefore, our halfway between answer of 257.5 above is correct.
Halfway Between
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Halfway Between 4 and 512
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