When you ask "What number is halfway between 11 and 391?" 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=391.
To find the number halfway between 11 and 391, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 391 into our formula, we get:
(11 + 391)/2 = 201
Thus, the number halfway between 11 and 391 is 201.
To check that our answer is correct, we subtract 11 from 201 and subtract 201 from 391 and compare the two numbers:
201 - 11 = 190
391 - 201 = 190
As you can see, the halfway number is 190 higher than 11 and 190 lower than 391. Therefore, our halfway between answer of 201 above is correct.
Halfway Between
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Halfway Between 11 and 392
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