When you ask "What number is halfway between 18 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=18 and Y=139.
To find the number halfway between 18 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 139 into our formula, we get:
(18 + 139)/2 = 78.5
Thus, the number halfway between 18 and 139 is 78.5.
To check that our answer is correct, we subtract 18 from 78.5 and subtract 78.5 from 139 and compare the two numbers:
78.5 - 18 = 60.5
139 - 78.5 = 60.5
As you can see, the halfway number is 60.5 higher than 18 and 60.5 lower than 139. Therefore, our halfway between answer of 78.5 above is correct.
Halfway Between
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Halfway Between 18 and 140
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