When you ask "What number is halfway between 84 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=84 and Y=771.
To find the number halfway between 84 and 771, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 771 into our formula, we get:
(84 + 771)/2 = 427.5
Thus, the number halfway between 84 and 771 is 427.5.
To check that our answer is correct, we subtract 84 from 427.5 and subtract 427.5 from 771 and compare the two numbers:
427.5 - 84 = 343.5
771 - 427.5 = 343.5
As you can see, the halfway number is 343.5 higher than 84 and 343.5 lower than 771. Therefore, our halfway between answer of 427.5 above is correct.
Halfway Between
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Halfway Between 84 and 772
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