When you ask "What number is halfway between 82 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=82 and Y=687.
To find the number halfway between 82 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 82 and 687 into our formula, we get:
(82 + 687)/2 = 384.5
Thus, the number halfway between 82 and 687 is 384.5.
To check that our answer is correct, we subtract 82 from 384.5 and subtract 384.5 from 687 and compare the two numbers:
384.5 - 82 = 302.5
687 - 384.5 = 302.5
As you can see, the halfway number is 302.5 higher than 82 and 302.5 lower than 687. Therefore, our halfway between answer of 384.5 above is correct.
Halfway Between
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Halfway Between 82 and 688
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