When you ask "What number is halfway between 16 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=16 and Y=687.
To find the number halfway between 16 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 16 and 687 into our formula, we get:
(16 + 687)/2 = 351.5
Thus, the number halfway between 16 and 687 is 351.5.
To check that our answer is correct, we subtract 16 from 351.5 and subtract 351.5 from 687 and compare the two numbers:
351.5 - 16 = 335.5
687 - 351.5 = 335.5
As you can see, the halfway number is 335.5 higher than 16 and 335.5 lower than 687. Therefore, our halfway between answer of 351.5 above is correct.
Halfway Between
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Halfway Between 16 and 688
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