When you ask "What number is halfway between 90 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=90 and Y=111.
To find the number halfway between 90 and 111, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 90 and 111 into our formula, we get:
(90 + 111)/2 = 100.5
Thus, the number halfway between 90 and 111 is 100.5.
To check that our answer is correct, we subtract 90 from 100.5 and subtract 100.5 from 111 and compare the two numbers:
100.5 - 90 = 10.5
111 - 100.5 = 10.5
As you can see, the halfway number is 10.5 higher than 90 and 10.5 lower than 111. Therefore, our halfway between answer of 100.5 above is correct.
Halfway Between
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Halfway Between 90 and 112
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