
When you ask "What number is halfway between 11 and 864?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=11 and Y=864.

To find the number halfway between 11 and 864, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 864 into our formula, we get:
(11 + 864)/2 = 437.5
Thus, the number halfway between 11 and 864 is 437.5.
To check that our answer is correct, we subtract 11 from 437.5 and subtract 437.5 from 864 and compare the two numbers:
437.5 - 11 = 426.5
864 - 437.5 = 426.5
As you can see, the halfway number is 426.5 higher than 11 and 426.5 lower than 864. Therefore, our halfway between answer of 437.5 above is correct.
Halfway Between
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Halfway Between 11 and 865
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