When you ask "What number is halfway between 12 and 393?" 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=393.
To find the number halfway between 12 and 393, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 393 into our formula, we get:
(12 + 393)/2 = 202.5
Thus, the number halfway between 12 and 393 is 202.5.
To check that our answer is correct, we subtract 12 from 202.5 and subtract 202.5 from 393 and compare the two numbers:
202.5 - 12 = 190.5
393 - 202.5 = 190.5
As you can see, the halfway number is 190.5 higher than 12 and 190.5 lower than 393. Therefore, our halfway between answer of 202.5 above is correct.
Halfway Between
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Halfway Between 12 and 394
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