When you ask "What number is halfway between 77 and 668?" 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=668.
To find the number halfway between 77 and 668, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 77 and 668 into our formula, we get:
(77 + 668)/2 = 372.5
Thus, the number halfway between 77 and 668 is 372.5.
To check that our answer is correct, we subtract 77 from 372.5 and subtract 372.5 from 668 and compare the two numbers:
372.5 - 77 = 295.5
668 - 372.5 = 295.5
As you can see, the halfway number is 295.5 higher than 77 and 295.5 lower than 668. Therefore, our halfway between answer of 372.5 above is correct.
Halfway Between
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