When you ask "What number is halfway between 15 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=15 and Y=256.
To find the number halfway between 15 and 256, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 256 into our formula, we get:
(15 + 256)/2 = 135.5
Thus, the number halfway between 15 and 256 is 135.5.
To check that our answer is correct, we subtract 15 from 135.5 and subtract 135.5 from 256 and compare the two numbers:
135.5 - 15 = 120.5
256 - 135.5 = 120.5
As you can see, the halfway number is 120.5 higher than 15 and 120.5 lower than 256. Therefore, our halfway between answer of 135.5 above is correct.
Halfway Between
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Halfway Between 15 and 257
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