When you ask "What number is halfway between 51 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=51 and Y=255.
To find the number halfway between 51 and 255, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 255 into our formula, we get:
(51 + 255)/2 = 153
Thus, the number halfway between 51 and 255 is 153.
To check that our answer is correct, we subtract 51 from 153 and subtract 153 from 255 and compare the two numbers:
153 - 51 = 102
255 - 153 = 102
As you can see, the halfway number is 102 higher than 51 and 102 lower than 255. Therefore, our halfway between answer of 153 above is correct.
Halfway Between
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Halfway Between 51 and 256
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