When you ask "What number is halfway between 99 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=99 and Y=821.
To find the number halfway between 99 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 821 into our formula, we get:
(99 + 821)/2 = 460
Thus, the number halfway between 99 and 821 is 460.
To check that our answer is correct, we subtract 99 from 460 and subtract 460 from 821 and compare the two numbers:
460 - 99 = 361
821 - 460 = 361
As you can see, the halfway number is 361 higher than 99 and 361 lower than 821. Therefore, our halfway between answer of 460 above is correct.
Halfway Between
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Halfway Between 99 and 822
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