When you ask "What number is halfway between 30 and 891?" 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=891.
To find the number halfway between 30 and 891, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 891 into our formula, we get:
(30 + 891)/2 = 460.5
Thus, the number halfway between 30 and 891 is 460.5.
To check that our answer is correct, we subtract 30 from 460.5 and subtract 460.5 from 891 and compare the two numbers:
460.5 - 30 = 430.5
891 - 460.5 = 430.5
As you can see, the halfway number is 430.5 higher than 30 and 430.5 lower than 891. Therefore, our halfway between answer of 460.5 above is correct.
Halfway Between
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Halfway Between 30 and 892
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