When you ask "What number is halfway between 20 and 687?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=20 and Y=687.
To find the number halfway between 20 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 687 into our formula, we get:
(20 + 687)/2 = 353.5
Thus, the number halfway between 20 and 687 is 353.5.
To check that our answer is correct, we subtract 20 from 353.5 and subtract 353.5 from 687 and compare the two numbers:
353.5 - 20 = 333.5
687 - 353.5 = 333.5
As you can see, the halfway number is 333.5 higher than 20 and 333.5 lower than 687. Therefore, our halfway between answer of 353.5 above is correct.
Halfway Between
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Halfway Between 20 and 688
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