
When you ask "What number is halfway between 9 and 189?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=9 and Y=189.

To find the number halfway between 9 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 9 and 189 into our formula, we get:
(9 + 189)/2 = 99
Thus, the number halfway between 9 and 189 is 99.
To check that our answer is correct, we subtract 9 from 99 and subtract 99 from 189 and compare the two numbers:
99 - 9 = 90
189 - 99 = 90
As you can see, the halfway number is 90 higher than 9 and 90 lower than 189. Therefore, our halfway between answer of 99 above is correct.
Halfway Between
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Halfway Between 9 and 190
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