When you ask "What number is halfway between 21 and 804?" 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=804.
To find the number halfway between 21 and 804, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 804 into our formula, we get:
(21 + 804)/2 = 412.5
Thus, the number halfway between 21 and 804 is 412.5.
To check that our answer is correct, we subtract 21 from 412.5 and subtract 412.5 from 804 and compare the two numbers:
412.5 - 21 = 391.5
804 - 412.5 = 391.5
As you can see, the halfway number is 391.5 higher than 21 and 391.5 lower than 804. Therefore, our halfway between answer of 412.5 above is correct.
Halfway Between
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Halfway Between 21 and 805
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