When you ask "What number is halfway between 8 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=8 and Y=687.
To find the number halfway between 8 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 8 and 687 into our formula, we get:
(8 + 687)/2 = 347.5
Thus, the number halfway between 8 and 687 is 347.5.
To check that our answer is correct, we subtract 8 from 347.5 and subtract 347.5 from 687 and compare the two numbers:
347.5 - 8 = 339.5
687 - 347.5 = 339.5
As you can see, the halfway number is 339.5 higher than 8 and 339.5 lower than 687. Therefore, our halfway between answer of 347.5 above is correct.
Halfway Between
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Halfway Between 8 and 688
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