When you ask "What number is halfway between 30 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=30 and Y=255.
To find the number halfway between 30 and 255, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 255 into our formula, we get:
(30 + 255)/2 = 142.5
Thus, the number halfway between 30 and 255 is 142.5.
To check that our answer is correct, we subtract 30 from 142.5 and subtract 142.5 from 255 and compare the two numbers:
142.5 - 30 = 112.5
255 - 142.5 = 112.5
As you can see, the halfway number is 112.5 higher than 30 and 112.5 lower than 255. Therefore, our halfway between answer of 142.5 above is correct.
Halfway Between
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Halfway Between 30 and 256
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