When you ask "What number is halfway between 30 and 821?" 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=821.
To find the number halfway between 30 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 821 into our formula, we get:
(30 + 821)/2 = 425.5
Thus, the number halfway between 30 and 821 is 425.5.
To check that our answer is correct, we subtract 30 from 425.5 and subtract 425.5 from 821 and compare the two numbers:
425.5 - 30 = 395.5
821 - 425.5 = 395.5
As you can see, the halfway number is 395.5 higher than 30 and 395.5 lower than 821. Therefore, our halfway between answer of 425.5 above is correct.
Halfway Between
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Halfway Between 30 and 822
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