When you ask "What number is halfway between 30 and 857?" 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=857.
To find the number halfway between 30 and 857, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 857 into our formula, we get:
(30 + 857)/2 = 443.5
Thus, the number halfway between 30 and 857 is 443.5.
To check that our answer is correct, we subtract 30 from 443.5 and subtract 443.5 from 857 and compare the two numbers:
443.5 - 30 = 413.5
857 - 443.5 = 413.5
As you can see, the halfway number is 413.5 higher than 30 and 413.5 lower than 857. Therefore, our halfway between answer of 443.5 above is correct.
Halfway Between
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Halfway Between 30 and 858
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