When you ask "What number is halfway between 77 and 123?" 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=123.
To find the number halfway between 77 and 123, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 123 into our formula, we get:
(77 + 123)/2 = 100
Thus, the number halfway between 77 and 123 is 100.
To check that our answer is correct, we subtract 77 from 100 and subtract 100 from 123 and compare the two numbers:
100 - 77 = 23
123 - 100 = 23
As you can see, the halfway number is 23 higher than 77 and 23 lower than 123. Therefore, our halfway between answer of 100 above is correct.
Halfway Between
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Halfway Between 77 and 124
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