When you ask "What number is halfway between 27 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=27 and Y=111.
To find the number halfway between 27 and 111, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 27 and 111 into our formula, we get:
(27 + 111)/2 = 69
Thus, the number halfway between 27 and 111 is 69.
To check that our answer is correct, we subtract 27 from 69 and subtract 69 from 111 and compare the two numbers:
69 - 27 = 42
111 - 69 = 42
As you can see, the halfway number is 42 higher than 27 and 42 lower than 111. Therefore, our halfway between answer of 69 above is correct.
Halfway Between
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Halfway Between 27 and 112
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