When you ask "What number is halfway between 77 and 390?" 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=390.
To find the number halfway between 77 and 390, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 390 into our formula, we get:
(77 + 390)/2 = 233.5
Thus, the number halfway between 77 and 390 is 233.5.
To check that our answer is correct, we subtract 77 from 233.5 and subtract 233.5 from 390 and compare the two numbers:
233.5 - 77 = 156.5
390 - 233.5 = 156.5
As you can see, the halfway number is 156.5 higher than 77 and 156.5 lower than 390. Therefore, our halfway between answer of 233.5 above is correct.
Halfway Between
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Halfway Between 77 and 391
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