When you ask "What number is halfway between 8 and 771?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=8 and Y=771.
To find the number halfway between 8 and 771, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 771 into our formula, we get:
(8 + 771)/2 = 389.5
Thus, the number halfway between 8 and 771 is 389.5.
To check that our answer is correct, we subtract 8 from 389.5 and subtract 389.5 from 771 and compare the two numbers:
389.5 - 8 = 381.5
771 - 389.5 = 381.5
As you can see, the halfway number is 381.5 higher than 8 and 381.5 lower than 771. Therefore, our halfway between answer of 389.5 above is correct.
Halfway Between
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Halfway Between 8 and 772
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