When you ask "What number is halfway between 99 and 688?" 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=688.
To find the number halfway between 99 and 688, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 688 into our formula, we get:
(99 + 688)/2 = 393.5
Thus, the number halfway between 99 and 688 is 393.5.
To check that our answer is correct, we subtract 99 from 393.5 and subtract 393.5 from 688 and compare the two numbers:
393.5 - 99 = 294.5
688 - 393.5 = 294.5
As you can see, the halfway number is 294.5 higher than 99 and 294.5 lower than 688. Therefore, our halfway between answer of 393.5 above is correct.
Halfway Between
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