When you ask "What number is halfway between 77 and 878?" 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=878.
To find the number halfway between 77 and 878, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 878 into our formula, we get:
(77 + 878)/2 = 477.5
Thus, the number halfway between 77 and 878 is 477.5.
To check that our answer is correct, we subtract 77 from 477.5 and subtract 477.5 from 878 and compare the two numbers:
477.5 - 77 = 400.5
878 - 477.5 = 400.5
As you can see, the halfway number is 400.5 higher than 77 and 400.5 lower than 878. Therefore, our halfway between answer of 477.5 above is correct.
Halfway Between
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Halfway Between 77 and 879
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