When you ask "What number is halfway between 12 and 403?" 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=403.
To find the number halfway between 12 and 403, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 403 into our formula, we get:
(12 + 403)/2 = 207.5
Thus, the number halfway between 12 and 403 is 207.5.
To check that our answer is correct, we subtract 12 from 207.5 and subtract 207.5 from 403 and compare the two numbers:
207.5 - 12 = 195.5
403 - 207.5 = 195.5
As you can see, the halfway number is 195.5 higher than 12 and 195.5 lower than 403. Therefore, our halfway between answer of 207.5 above is correct.
Halfway Between
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Halfway Between 12 and 404
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