When you ask "What number is halfway between 21 and 680?" 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=680.
To find the number halfway between 21 and 680, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 680 into our formula, we get:
(21 + 680)/2 = 350.5
Thus, the number halfway between 21 and 680 is 350.5.
To check that our answer is correct, we subtract 21 from 350.5 and subtract 350.5 from 680 and compare the two numbers:
350.5 - 21 = 329.5
680 - 350.5 = 329.5
As you can see, the halfway number is 329.5 higher than 21 and 329.5 lower than 680. Therefore, our halfway between answer of 350.5 above is correct.
Halfway Between
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