When you ask "What number is halfway between 30 and 827?" 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=827.
To find the number halfway between 30 and 827, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 827 into our formula, we get:
(30 + 827)/2 = 428.5
Thus, the number halfway between 30 and 827 is 428.5.
To check that our answer is correct, we subtract 30 from 428.5 and subtract 428.5 from 827 and compare the two numbers:
428.5 - 30 = 398.5
827 - 428.5 = 398.5
As you can see, the halfway number is 398.5 higher than 30 and 398.5 lower than 827. Therefore, our halfway between answer of 428.5 above is correct.
Halfway Between
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Halfway Between 30 and 828
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