When you ask "What number is halfway between 12 and 823?" 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=823.
To find the number halfway between 12 and 823, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 823 into our formula, we get:
(12 + 823)/2 = 417.5
Thus, the number halfway between 12 and 823 is 417.5.
To check that our answer is correct, we subtract 12 from 417.5 and subtract 417.5 from 823 and compare the two numbers:
417.5 - 12 = 405.5
823 - 417.5 = 405.5
As you can see, the halfway number is 405.5 higher than 12 and 405.5 lower than 823. Therefore, our halfway between answer of 417.5 above is correct.
Halfway Between
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Halfway Between 12 and 824
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