When you ask "What number is halfway between 18 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=18 and Y=189.
To find the number halfway between 18 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 189 into our formula, we get:
(18 + 189)/2 = 103.5
Thus, the number halfway between 18 and 189 is 103.5.
To check that our answer is correct, we subtract 18 from 103.5 and subtract 103.5 from 189 and compare the two numbers:
103.5 - 18 = 85.5
189 - 103.5 = 85.5
As you can see, the halfway number is 85.5 higher than 18 and 85.5 lower than 189. Therefore, our halfway between answer of 103.5 above is correct.
Halfway Between
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Halfway Between 18 and 190
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