When you ask "What number is halfway between 100 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=100 and Y=111.
To find the number halfway between 100 and 111, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 111 into our formula, we get:
(100 + 111)/2 = 105.5
Thus, the number halfway between 100 and 111 is 105.5.
To check that our answer is correct, we subtract 100 from 105.5 and subtract 105.5 from 111 and compare the two numbers:
105.5 - 100 = 5.5
111 - 105.5 = 5.5
As you can see, the halfway number is 5.5 higher than 100 and 5.5 lower than 111. Therefore, our halfway between answer of 105.5 above is correct.
Halfway Between
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Halfway Between 100 and 112
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