When you ask "What number is halfway between 77 and 129?" 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=129.
To find the number halfway between 77 and 129, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 129 into our formula, we get:
(77 + 129)/2 = 103
Thus, the number halfway between 77 and 129 is 103.
To check that our answer is correct, we subtract 77 from 103 and subtract 103 from 129 and compare the two numbers:
103 - 77 = 26
129 - 103 = 26
As you can see, the halfway number is 26 higher than 77 and 26 lower than 129. Therefore, our halfway between answer of 103 above is correct.
Halfway Between
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Halfway Between 77 and 130
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