When you ask "What number is halfway between 4 and 255?" 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=255.
To find the number halfway between 4 and 255, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 4 and 255 into our formula, we get:
(4 + 255)/2 = 129.5
Thus, the number halfway between 4 and 255 is 129.5.
To check that our answer is correct, we subtract 4 from 129.5 and subtract 129.5 from 255 and compare the two numbers:
129.5 - 4 = 125.5
255 - 129.5 = 125.5
As you can see, the halfway number is 125.5 higher than 4 and 125.5 lower than 255. Therefore, our halfway between answer of 129.5 above is correct.
Halfway Between
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Halfway Between 4 and 256
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