When you ask "What number is halfway between 12 and 405?" 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=405.
To find the number halfway between 12 and 405, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 405 into our formula, we get:
(12 + 405)/2 = 208.5
Thus, the number halfway between 12 and 405 is 208.5.
To check that our answer is correct, we subtract 12 from 208.5 and subtract 208.5 from 405 and compare the two numbers:
208.5 - 12 = 196.5
405 - 208.5 = 196.5
As you can see, the halfway number is 196.5 higher than 12 and 196.5 lower than 405. Therefore, our halfway between answer of 208.5 above is correct.
Halfway Between
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Halfway Between 12 and 406
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