When you ask "What number is halfway between 77 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=77 and Y=139.
To find the number halfway between 77 and 139, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 139 into our formula, we get:
(77 + 139)/2 = 108
Thus, the number halfway between 77 and 139 is 108.
To check that our answer is correct, we subtract 77 from 108 and subtract 108 from 139 and compare the two numbers:
108 - 77 = 31
139 - 108 = 31
As you can see, the halfway number is 31 higher than 77 and 31 lower than 139. Therefore, our halfway between answer of 108 above is correct.
Halfway Between
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Halfway Between 77 and 140
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