When you ask "What number is halfway between 20 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=20 and Y=189.
To find the number halfway between 20 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 20 and 189 into our formula, we get:
(20 + 189)/2 = 104.5
Thus, the number halfway between 20 and 189 is 104.5.
To check that our answer is correct, we subtract 20 from 104.5 and subtract 104.5 from 189 and compare the two numbers:
104.5 - 20 = 84.5
189 - 104.5 = 84.5
As you can see, the halfway number is 84.5 higher than 20 and 84.5 lower than 189. Therefore, our halfway between answer of 104.5 above is correct.
Halfway Between
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Halfway Between 20 and 190
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