When you ask "What number is halfway between 21 and 904?" 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=904.
To find the number halfway between 21 and 904, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 904 into our formula, we get:
(21 + 904)/2 = 462.5
Thus, the number halfway between 21 and 904 is 462.5.
To check that our answer is correct, we subtract 21 from 462.5 and subtract 462.5 from 904 and compare the two numbers:
462.5 - 21 = 441.5
904 - 462.5 = 441.5
As you can see, the halfway number is 441.5 higher than 21 and 441.5 lower than 904. Therefore, our halfway between answer of 462.5 above is correct.
Halfway Between
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Halfway Between 21 and 905
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