When you ask "What number is halfway between 10 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=10 and Y=255.
To find the number halfway between 10 and 255, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 255 into our formula, we get:
(10 + 255)/2 = 132.5
Thus, the number halfway between 10 and 255 is 132.5.
To check that our answer is correct, we subtract 10 from 132.5 and subtract 132.5 from 255 and compare the two numbers:
132.5 - 10 = 122.5
255 - 132.5 = 122.5
As you can see, the halfway number is 122.5 higher than 10 and 122.5 lower than 255. Therefore, our halfway between answer of 132.5 above is correct.
Halfway Between
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Halfway Between 10 and 256
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