When you ask "What number is halfway between 12 and 491?" 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=491.
To find the number halfway between 12 and 491, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 491 into our formula, we get:
(12 + 491)/2 = 251.5
Thus, the number halfway between 12 and 491 is 251.5.
To check that our answer is correct, we subtract 12 from 251.5 and subtract 251.5 from 491 and compare the two numbers:
251.5 - 12 = 239.5
491 - 251.5 = 239.5
As you can see, the halfway number is 239.5 higher than 12 and 239.5 lower than 491. Therefore, our halfway between answer of 251.5 above is correct.
Halfway Between
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Halfway Between 12 and 492
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