When you ask "What number is halfway between 12 and 865?" 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=865.
To find the number halfway between 12 and 865, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 865 into our formula, we get:
(12 + 865)/2 = 438.5
Thus, the number halfway between 12 and 865 is 438.5.
To check that our answer is correct, we subtract 12 from 438.5 and subtract 438.5 from 865 and compare the two numbers:
438.5 - 12 = 426.5
865 - 438.5 = 426.5
As you can see, the halfway number is 426.5 higher than 12 and 426.5 lower than 865. Therefore, our halfway between answer of 438.5 above is correct.
Halfway Between
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Halfway Between 12 and 866
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