When you ask "What number is halfway between 99 and 684?" 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=684.
To find the number halfway between 99 and 684, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 684 into our formula, we get:
(99 + 684)/2 = 391.5
Thus, the number halfway between 99 and 684 is 391.5.
To check that our answer is correct, we subtract 99 from 391.5 and subtract 391.5 from 684 and compare the two numbers:
391.5 - 99 = 292.5
684 - 391.5 = 292.5
As you can see, the halfway number is 292.5 higher than 99 and 292.5 lower than 684. Therefore, our halfway between answer of 391.5 above is correct.
Halfway Between
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Halfway Between 99 and 685
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