When you ask "What number is halfway between 12 and 505?" 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=505.
To find the number halfway between 12 and 505, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 505 into our formula, we get:
(12 + 505)/2 = 258.5
Thus, the number halfway between 12 and 505 is 258.5.
To check that our answer is correct, we subtract 12 from 258.5 and subtract 258.5 from 505 and compare the two numbers:
258.5 - 12 = 246.5
505 - 258.5 = 246.5
As you can see, the halfway number is 246.5 higher than 12 and 246.5 lower than 505. Therefore, our halfway between answer of 258.5 above is correct.
Halfway Between
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Halfway Between 12 and 506
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