When you ask "What number is halfway between 80 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=80 and Y=139.
To find the number halfway between 80 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 80 and 139 into our formula, we get:
(80 + 139)/2 = 109.5
Thus, the number halfway between 80 and 139 is 109.5.
To check that our answer is correct, we subtract 80 from 109.5 and subtract 109.5 from 139 and compare the two numbers:
109.5 - 80 = 29.5
139 - 109.5 = 29.5
As you can see, the halfway number is 29.5 higher than 80 and 29.5 lower than 139. Therefore, our halfway between answer of 109.5 above is correct.
Halfway Between
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Halfway Between 80 and 140
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