When you ask "What number is halfway between 18 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=18 and Y=111.
To find the number halfway between 18 and 111, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 111 into our formula, we get:
(18 + 111)/2 = 64.5
Thus, the number halfway between 18 and 111 is 64.5.
To check that our answer is correct, we subtract 18 from 64.5 and subtract 64.5 from 111 and compare the two numbers:
64.5 - 18 = 46.5
111 - 64.5 = 46.5
As you can see, the halfway number is 46.5 higher than 18 and 46.5 lower than 111. Therefore, our halfway between answer of 64.5 above is correct.
Halfway Between
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Halfway Between 18 and 112
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