When you ask "What number is halfway between 12 and 805?" 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=805.
To find the number halfway between 12 and 805, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 805 into our formula, we get:
(12 + 805)/2 = 408.5
Thus, the number halfway between 12 and 805 is 408.5.
To check that our answer is correct, we subtract 12 from 408.5 and subtract 408.5 from 805 and compare the two numbers:
408.5 - 12 = 396.5
805 - 408.5 = 396.5
As you can see, the halfway number is 396.5 higher than 12 and 396.5 lower than 805. Therefore, our halfway between answer of 408.5 above is correct.
Halfway Between
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Halfway Between 12 and 806
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