
When you ask "What number is halfway between 75 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=75 and Y=855.

To find the number halfway between 75 and 855, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 75 and 855 into our formula, we get:
(75 + 855)/2 = 465
Thus, the number halfway between 75 and 855 is 465.
To check that our answer is correct, we subtract 75 from 465 and subtract 465 from 855 and compare the two numbers:
465 - 75 = 390
855 - 465 = 390
As you can see, the halfway number is 390 higher than 75 and 390 lower than 855. Therefore, our halfway between answer of 465 above is correct.
Halfway Between
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Halfway Between 75 and 856
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