When you ask "What number is halfway between 11 and 680?" 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=680.
To find the number halfway between 11 and 680, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 680 into our formula, we get:
(11 + 680)/2 = 345.5
Thus, the number halfway between 11 and 680 is 345.5.
To check that our answer is correct, we subtract 11 from 345.5 and subtract 345.5 from 680 and compare the two numbers:
345.5 - 11 = 334.5
680 - 345.5 = 334.5
As you can see, the halfway number is 334.5 higher than 11 and 334.5 lower than 680. Therefore, our halfway between answer of 345.5 above is correct.
Halfway Between
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