When you ask "What number is halfway between 84 and 139?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=84 and Y=139.
To find the number halfway between 84 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 139 into our formula, we get:
(84 + 139)/2 = 111.5
Thus, the number halfway between 84 and 139 is 111.5.
To check that our answer is correct, we subtract 84 from 111.5 and subtract 111.5 from 139 and compare the two numbers:
111.5 - 84 = 27.5
139 - 111.5 = 27.5
As you can see, the halfway number is 27.5 higher than 84 and 27.5 lower than 139. Therefore, our halfway between answer of 111.5 above is correct.
Halfway Between
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Halfway Between 84 and 140
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