When you ask "What number is halfway between 77 and 128?" 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=128.
To find the number halfway between 77 and 128, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 128 into our formula, we get:
(77 + 128)/2 = 102.5
Thus, the number halfway between 77 and 128 is 102.5.
To check that our answer is correct, we subtract 77 from 102.5 and subtract 102.5 from 128 and compare the two numbers:
102.5 - 77 = 25.5
128 - 102.5 = 25.5
As you can see, the halfway number is 25.5 higher than 77 and 25.5 lower than 128. Therefore, our halfway between answer of 102.5 above is correct.
Halfway Between
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Halfway Between 77 and 129
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