When you ask "What number is halfway between 77 and 90?" 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=90.
To find the number halfway between 77 and 90, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 90 into our formula, we get:
(77 + 90)/2 = 83.5
Thus, the number halfway between 77 and 90 is 83.5.
To check that our answer is correct, we subtract 77 from 83.5 and subtract 83.5 from 90 and compare the two numbers:
83.5 - 77 = 6.5
90 - 83.5 = 6.5
As you can see, the halfway number is 6.5 higher than 77 and 6.5 lower than 90. Therefore, our halfway between answer of 83.5 above is correct.
Halfway Between
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Halfway Between 77 and 91
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