When you ask "What number is halfway between 21 and 798?" 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=798.
To find the number halfway between 21 and 798, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 798 into our formula, we get:
(21 + 798)/2 = 409.5
Thus, the number halfway between 21 and 798 is 409.5.
To check that our answer is correct, we subtract 21 from 409.5 and subtract 409.5 from 798 and compare the two numbers:
409.5 - 21 = 388.5
798 - 409.5 = 388.5
As you can see, the halfway number is 388.5 higher than 21 and 388.5 lower than 798. Therefore, our halfway between answer of 409.5 above is correct.
Halfway Between
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Halfway Between 21 and 799
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