When you ask "What number is halfway between 12 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=12 and Y=391.
To find the number halfway between 12 and 391, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 391 into our formula, we get:
(12 + 391)/2 = 201.5
Thus, the number halfway between 12 and 391 is 201.5.
To check that our answer is correct, we subtract 12 from 201.5 and subtract 201.5 from 391 and compare the two numbers:
201.5 - 12 = 189.5
391 - 201.5 = 189.5
As you can see, the halfway number is 189.5 higher than 12 and 189.5 lower than 391. Therefore, our halfway between answer of 201.5 above is correct.
Halfway Between
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Halfway Between 12 and 392
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