When you ask "What number is halfway between 55 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=55 and Y=255.
To find the number halfway between 55 and 255, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 55 and 255 into our formula, we get:
(55 + 255)/2 = 155
Thus, the number halfway between 55 and 255 is 155.
To check that our answer is correct, we subtract 55 from 155 and subtract 155 from 255 and compare the two numbers:
155 - 55 = 100
255 - 155 = 100
As you can see, the halfway number is 100 higher than 55 and 100 lower than 255. Therefore, our halfway between answer of 155 above is correct.
Halfway Between
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Halfway Between 55 and 256
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