When you ask "What number is halfway between 21 and 480?" 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=480.
To find the number halfway between 21 and 480, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 480 into our formula, we get:
(21 + 480)/2 = 250.5
Thus, the number halfway between 21 and 480 is 250.5.
To check that our answer is correct, we subtract 21 from 250.5 and subtract 250.5 from 480 and compare the two numbers:
250.5 - 21 = 229.5
480 - 250.5 = 229.5
As you can see, the halfway number is 229.5 higher than 21 and 229.5 lower than 480. Therefore, our halfway between answer of 250.5 above is correct.
Halfway Between
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Halfway Between 21 and 481
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