When you ask "What number is halfway between 12 and 111?" 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=111.
To find the number halfway between 12 and 111, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 12 and 111 into our formula, we get:
(12 + 111)/2 = 61.5
Thus, the number halfway between 12 and 111 is 61.5.
To check that our answer is correct, we subtract 12 from 61.5 and subtract 61.5 from 111 and compare the two numbers:
61.5 - 12 = 49.5
111 - 61.5 = 49.5
As you can see, the halfway number is 49.5 higher than 12 and 49.5 lower than 111. Therefore, our halfway between answer of 61.5 above is correct.
Halfway Between
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Halfway Between 12 and 112
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