When you ask "What number is halfway between 11 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=11 and Y=686.
To find the number halfway between 11 and 686, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 686 into our formula, we get:
(11 + 686)/2 = 348.5
Thus, the number halfway between 11 and 686 is 348.5.
To check that our answer is correct, we subtract 11 from 348.5 and subtract 348.5 from 686 and compare the two numbers:
348.5 - 11 = 337.5
686 - 348.5 = 337.5
As you can see, the halfway number is 337.5 higher than 11 and 337.5 lower than 686. Therefore, our halfway between answer of 348.5 above is correct.
Halfway Between
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Halfway Between 11 and 687
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