When you ask "What number is halfway between 21 and 822?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=21 and Y=822.
To find the number halfway between 21 and 822, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 822 into our formula, we get:
(21 + 822)/2 = 421.5
Thus, the number halfway between 21 and 822 is 421.5.
To check that our answer is correct, we subtract 21 from 421.5 and subtract 421.5 from 822 and compare the two numbers:
421.5 - 21 = 400.5
822 - 421.5 = 400.5
As you can see, the halfway number is 400.5 higher than 21 and 400.5 lower than 822. Therefore, our halfway between answer of 421.5 above is correct.
Halfway Between
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Halfway Between 21 and 823
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