When you ask "What number is halfway between 11 and 666?" 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=666.
To find the number halfway between 11 and 666, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 666 into our formula, we get:
(11 + 666)/2 = 338.5
Thus, the number halfway between 11 and 666 is 338.5.
To check that our answer is correct, we subtract 11 from 338.5 and subtract 338.5 from 666 and compare the two numbers:
338.5 - 11 = 327.5
666 - 338.5 = 327.5
As you can see, the halfway number is 327.5 higher than 11 and 327.5 lower than 666. Therefore, our halfway between answer of 338.5 above is correct.
Halfway Between
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Halfway Between 11 and 667
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