
When you ask "What number is halfway between 0 and 855?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=0 and Y=855.

To find the number halfway between 0 and 855, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 0 and 855 into our formula, we get:
(0 + 855)/2 = 427.5
Thus, the number halfway between 0 and 855 is 427.5.
To check that our answer is correct, we subtract 0 from 427.5 and subtract 427.5 from 855 and compare the two numbers:
427.5 - 0 = 427.5
855 - 427.5 = 427.5
As you can see, the halfway number is 427.5 higher than 0 and 427.5 lower than 855. Therefore, our halfway between answer of 427.5 above is correct.
Halfway Between
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Halfway Between 0 and 856
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