When you ask "What number is halfway between 12 and 305?" 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=305.
To find the number halfway between 12 and 305, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 305 into our formula, we get:
(12 + 305)/2 = 158.5
Thus, the number halfway between 12 and 305 is 158.5.
To check that our answer is correct, we subtract 12 from 158.5 and subtract 158.5 from 305 and compare the two numbers:
158.5 - 12 = 146.5
305 - 158.5 = 146.5
As you can see, the halfway number is 146.5 higher than 12 and 146.5 lower than 305. Therefore, our halfway between answer of 158.5 above is correct.
Halfway Between
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Halfway Between 12 and 306
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