When you ask "What number is halfway between 15 and 686?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=686.
To find the number halfway between 15 and 686, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 15 and 686 into our formula, we get:
(15 + 686)/2 = 350.5
Thus, the number halfway between 15 and 686 is 350.5.
To check that our answer is correct, we subtract 15 from 350.5 and subtract 350.5 from 686 and compare the two numbers:
350.5 - 15 = 335.5
686 - 350.5 = 335.5
As you can see, the halfway number is 335.5 higher than 15 and 335.5 lower than 686. Therefore, our halfway between answer of 350.5 above is correct.
Halfway Between
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Halfway Between 15 and 687
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