When you ask "What number is halfway between 77 and 80?" 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=80.
To find the number halfway between 77 and 80, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 80 into our formula, we get:
(77 + 80)/2 = 78.5
Thus, the number halfway between 77 and 80 is 78.5.
To check that our answer is correct, we subtract 77 from 78.5 and subtract 78.5 from 80 and compare the two numbers:
78.5 - 77 = 1.5
80 - 78.5 = 1.5
As you can see, the halfway number is 1.5 higher than 77 and 1.5 lower than 80. Therefore, our halfway between answer of 78.5 above is correct.
Halfway Between
Find halfway between two other numbers here!
Halfway Between 77 and 81
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