When you ask "What number is halfway between 90 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=90 and Y=255.
To find the number halfway between 90 and 255, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 255 into our formula, we get:
(90 + 255)/2 = 172.5
Thus, the number halfway between 90 and 255 is 172.5.
To check that our answer is correct, we subtract 90 from 172.5 and subtract 172.5 from 255 and compare the two numbers:
172.5 - 90 = 82.5
255 - 172.5 = 82.5
As you can see, the halfway number is 82.5 higher than 90 and 82.5 lower than 255. Therefore, our halfway between answer of 172.5 above is correct.
Halfway Between
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Halfway Between 90 and 256
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