When you ask "What number is halfway between 21 and 396?" 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=396.
To find the number halfway between 21 and 396, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 396 into our formula, we get:
(21 + 396)/2 = 208.5
Thus, the number halfway between 21 and 396 is 208.5.
To check that our answer is correct, we subtract 21 from 208.5 and subtract 208.5 from 396 and compare the two numbers:
208.5 - 21 = 187.5
396 - 208.5 = 187.5
As you can see, the halfway number is 187.5 higher than 21 and 187.5 lower than 396. Therefore, our halfway between answer of 208.5 above is correct.
Halfway Between
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Halfway Between 21 and 397
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