When you ask "What number is halfway between 21 and 688?" 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=688.
To find the number halfway between 21 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 21 and 688 into our formula, we get:
(21 + 688)/2 = 354.5
Thus, the number halfway between 21 and 688 is 354.5.
To check that our answer is correct, we subtract 21 from 354.5 and subtract 354.5 from 688 and compare the two numbers:
354.5 - 21 = 333.5
688 - 354.5 = 333.5
As you can see, the halfway number is 333.5 higher than 21 and 333.5 lower than 688. Therefore, our halfway between answer of 354.5 above is correct.
Halfway Between
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