When you ask "What number is halfway between 11 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=11 and Y=821.
To find the number halfway between 11 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 821 into our formula, we get:
(11 + 821)/2 = 416
Thus, the number halfway between 11 and 821 is 416.
To check that our answer is correct, we subtract 11 from 416 and subtract 416 from 821 and compare the two numbers:
416 - 11 = 405
821 - 416 = 405
As you can see, the halfway number is 405 higher than 11 and 405 lower than 821. Therefore, our halfway between answer of 416 above is correct.
Halfway Between
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Halfway Between 11 and 822
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