
When you ask "What number is halfway between 12 and 625?" 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=625.

To find the number halfway between 12 and 625, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 625 into our formula, we get:
(12 + 625)/2 = 318.5
Thus, the number halfway between 12 and 625 is 318.5.
To check that our answer is correct, we subtract 12 from 318.5 and subtract 318.5 from 625 and compare the two numbers:
318.5 - 12 = 306.5
625 - 318.5 = 306.5
As you can see, the halfway number is 306.5 higher than 12 and 306.5 lower than 625. Therefore, our halfway between answer of 318.5 above is correct.
Halfway Between
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Halfway Between 12 and 626
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