When you ask "What number is halfway between 22 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=22 and Y=821.
To find the number halfway between 22 and 821, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 22 and 821 into our formula, we get:
(22 + 821)/2 = 421.5
Thus, the number halfway between 22 and 821 is 421.5.
To check that our answer is correct, we subtract 22 from 421.5 and subtract 421.5 from 821 and compare the two numbers:
421.5 - 22 = 399.5
821 - 421.5 = 399.5
As you can see, the halfway number is 399.5 higher than 22 and 399.5 lower than 821. Therefore, our halfway between answer of 421.5 above is correct.
Halfway Between
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Halfway Between 22 and 822
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