When you ask "What number is halfway between 30 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=30 and Y=855.
To find the number halfway between 30 and 855, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 855 into our formula, we get:
(30 + 855)/2 = 442.5
Thus, the number halfway between 30 and 855 is 442.5.
To check that our answer is correct, we subtract 30 from 442.5 and subtract 442.5 from 855 and compare the two numbers:
442.5 - 30 = 412.5
855 - 442.5 = 412.5
As you can see, the halfway number is 412.5 higher than 30 and 412.5 lower than 855. Therefore, our halfway between answer of 442.5 above is correct.
Halfway Between
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Halfway Between 30 and 856
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