When you ask "What number is halfway between 9 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=9 and Y=256.
To find the number halfway between 9 and 256, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 256 into our formula, we get:
(9 + 256)/2 = 132.5
Thus, the number halfway between 9 and 256 is 132.5.
To check that our answer is correct, we subtract 9 from 132.5 and subtract 132.5 from 256 and compare the two numbers:
132.5 - 9 = 123.5
256 - 132.5 = 123.5
As you can see, the halfway number is 123.5 higher than 9 and 123.5 lower than 256. Therefore, our halfway between answer of 132.5 above is correct.
Halfway Between
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Halfway Between 9 and 257
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