When you ask "What number is halfway between 12 and 621?" 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=621.
To find the number halfway between 12 and 621, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 621 into our formula, we get:
(12 + 621)/2 = 316.5
Thus, the number halfway between 12 and 621 is 316.5.
To check that our answer is correct, we subtract 12 from 316.5 and subtract 316.5 from 621 and compare the two numbers:
316.5 - 12 = 304.5
621 - 316.5 = 304.5
As you can see, the halfway number is 304.5 higher than 12 and 304.5 lower than 621. Therefore, our halfway between answer of 316.5 above is correct.
Halfway Between
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Halfway Between 12 and 622
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