When you ask "What number is halfway between 10 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=10 and Y=111.
To find the number halfway between 10 and 111, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 111 into our formula, we get:
(10 + 111)/2 = 60.5
Thus, the number halfway between 10 and 111 is 60.5.
To check that our answer is correct, we subtract 10 from 60.5 and subtract 60.5 from 111 and compare the two numbers:
60.5 - 10 = 50.5
111 - 60.5 = 50.5
As you can see, the halfway number is 50.5 higher than 10 and 50.5 lower than 111. Therefore, our halfway between answer of 60.5 above is correct.
Halfway Between
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Halfway Between 10 and 112
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