
When you ask "What number is halfway between 10 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=10 and Y=189.

To find the number halfway between 10 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 10 and 189 into our formula, we get:
(10 + 189)/2 = 99.5
Thus, the number halfway between 10 and 189 is 99.5.
To check that our answer is correct, we subtract 10 from 99.5 and subtract 99.5 from 189 and compare the two numbers:
99.5 - 10 = 89.5
189 - 99.5 = 89.5
As you can see, the halfway number is 89.5 higher than 10 and 89.5 lower than 189. Therefore, our halfway between answer of 99.5 above is correct.
Halfway Between
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Halfway Between 10 and 190
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