When you ask "What number is halfway between 21 and 408?" 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=408.
To find the number halfway between 21 and 408, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 408 into our formula, we get:
(21 + 408)/2 = 214.5
Thus, the number halfway between 21 and 408 is 214.5.
To check that our answer is correct, we subtract 21 from 214.5 and subtract 214.5 from 408 and compare the two numbers:
214.5 - 21 = 193.5
408 - 214.5 = 193.5
As you can see, the halfway number is 193.5 higher than 21 and 193.5 lower than 408. Therefore, our halfway between answer of 214.5 above is correct.
Halfway Between
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Halfway Between 21 and 409
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