When you ask "What number is halfway between 30 and 873?" 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=873.
To find the number halfway between 30 and 873, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 873 into our formula, we get:
(30 + 873)/2 = 451.5
Thus, the number halfway between 30 and 873 is 451.5.
To check that our answer is correct, we subtract 30 from 451.5 and subtract 451.5 from 873 and compare the two numbers:
451.5 - 30 = 421.5
873 - 451.5 = 421.5
As you can see, the halfway number is 421.5 higher than 30 and 421.5 lower than 873. Therefore, our halfway between answer of 451.5 above is correct.
Halfway Between
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Halfway Between 30 and 874
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