When you ask "What number is halfway between 77 and 138?" 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=138.
To find the number halfway between 77 and 138, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 138 into our formula, we get:
(77 + 138)/2 = 107.5
Thus, the number halfway between 77 and 138 is 107.5.
To check that our answer is correct, we subtract 77 from 107.5 and subtract 107.5 from 138 and compare the two numbers:
107.5 - 77 = 30.5
138 - 107.5 = 30.5
As you can see, the halfway number is 30.5 higher than 77 and 30.5 lower than 138. Therefore, our halfway between answer of 107.5 above is correct.
Halfway Between
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Halfway Between 77 and 139
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