When you ask "What number is halfway between 12 and 813?" 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=813.
To find the number halfway between 12 and 813, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 813 into our formula, we get:
(12 + 813)/2 = 412.5
Thus, the number halfway between 12 and 813 is 412.5.
To check that our answer is correct, we subtract 12 from 412.5 and subtract 412.5 from 813 and compare the two numbers:
412.5 - 12 = 400.5
813 - 412.5 = 400.5
As you can see, the halfway number is 400.5 higher than 12 and 400.5 lower than 813. Therefore, our halfway between answer of 412.5 above is correct.
Halfway Between
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Halfway Between 12 and 814
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