When you ask "What number is halfway between 21 and 668?" 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=668.
To find the number halfway between 21 and 668, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 668 into our formula, we get:
(21 + 668)/2 = 344.5
Thus, the number halfway between 21 and 668 is 344.5.
To check that our answer is correct, we subtract 21 from 344.5 and subtract 344.5 from 668 and compare the two numbers:
344.5 - 21 = 323.5
668 - 344.5 = 323.5
As you can see, the halfway number is 323.5 higher than 21 and 323.5 lower than 668. Therefore, our halfway between answer of 344.5 above is correct.
Halfway Between
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Halfway Between 21 and 669
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