When you ask "What number is halfway between 3 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=3 and Y=687.
To find the number halfway between 3 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 3 and 687 into our formula, we get:
(3 + 687)/2 = 345
Thus, the number halfway between 3 and 687 is 345.
To check that our answer is correct, we subtract 3 from 345 and subtract 345 from 687 and compare the two numbers:
345 - 3 = 342
687 - 345 = 342
As you can see, the halfway number is 342 higher than 3 and 342 lower than 687. Therefore, our halfway between answer of 345 above is correct.
Halfway Between
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Halfway Between 3 and 688
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