When you ask "What number is halfway between 99 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=99 and Y=687.
To find the number halfway between 99 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 687 into our formula, we get:
(99 + 687)/2 = 393
Thus, the number halfway between 99 and 687 is 393.
To check that our answer is correct, we subtract 99 from 393 and subtract 393 from 687 and compare the two numbers:
393 - 99 = 294
687 - 393 = 294
As you can see, the halfway number is 294 higher than 99 and 294 lower than 687. Therefore, our halfway between answer of 393 above is correct.
Halfway Between
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Halfway Between 99 and 688
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