When you ask "What number is halfway between 84 and 687?" 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=687.
To find the number halfway between 84 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 687 into our formula, we get:
(84 + 687)/2 = 385.5
Thus, the number halfway between 84 and 687 is 385.5.
To check that our answer is correct, we subtract 84 from 385.5 and subtract 385.5 from 687 and compare the two numbers:
385.5 - 84 = 301.5
687 - 385.5 = 301.5
As you can see, the halfway number is 301.5 higher than 84 and 301.5 lower than 687. Therefore, our halfway between answer of 385.5 above is correct.
Halfway Between
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Halfway Between 84 and 688
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