When you ask "What number is halfway between 51 and 256?" 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=256.
To find the number halfway between 51 and 256, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 51 and 256 into our formula, we get:
(51 + 256)/2 = 153.5
Thus, the number halfway between 51 and 256 is 153.5.
To check that our answer is correct, we subtract 51 from 153.5 and subtract 153.5 from 256 and compare the two numbers:
153.5 - 51 = 102.5
256 - 153.5 = 102.5
As you can see, the halfway number is 102.5 higher than 51 and 102.5 lower than 256. Therefore, our halfway between answer of 153.5 above is correct.
Halfway Between
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Halfway Between 51 and 257
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