When you ask "What number is halfway between 12 and 909?" 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=909.
To find the number halfway between 12 and 909, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 909 into our formula, we get:
(12 + 909)/2 = 460.5
Thus, the number halfway between 12 and 909 is 460.5.
To check that our answer is correct, we subtract 12 from 460.5 and subtract 460.5 from 909 and compare the two numbers:
460.5 - 12 = 448.5
909 - 460.5 = 448.5
As you can see, the halfway number is 448.5 higher than 12 and 448.5 lower than 909. Therefore, our halfway between answer of 460.5 above is correct.
Halfway Between
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Halfway Between 12 and 910
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