When you ask "What number is halfway between 24 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=24 and Y=821.
To find the number halfway between 24 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 24 and 821 into our formula, we get:
(24 + 821)/2 = 422.5
Thus, the number halfway between 24 and 821 is 422.5.
To check that our answer is correct, we subtract 24 from 422.5 and subtract 422.5 from 821 and compare the two numbers:
422.5 - 24 = 398.5
821 - 422.5 = 398.5
As you can see, the halfway number is 398.5 higher than 24 and 398.5 lower than 821. Therefore, our halfway between answer of 422.5 above is correct.
Halfway Between
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Halfway Between 24 and 822
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