When you ask "What number is halfway between 72 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=72 and Y=189.
To find the number halfway between 72 and 189, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 72 and 189 into our formula, we get:
(72 + 189)/2 = 130.5
Thus, the number halfway between 72 and 189 is 130.5.
To check that our answer is correct, we subtract 72 from 130.5 and subtract 130.5 from 189 and compare the two numbers:
130.5 - 72 = 58.5
189 - 130.5 = 58.5
As you can see, the halfway number is 58.5 higher than 72 and 58.5 lower than 189. Therefore, our halfway between answer of 130.5 above is correct.
Halfway Between
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Halfway Between 72 and 190
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