When you ask "What number is halfway between 99 and 391?" 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=391.
To find the number halfway between 99 and 391, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 391 into our formula, we get:
(99 + 391)/2 = 245
Thus, the number halfway between 99 and 391 is 245.
To check that our answer is correct, we subtract 99 from 245 and subtract 245 from 391 and compare the two numbers:
245 - 99 = 146
391 - 245 = 146
As you can see, the halfway number is 146 higher than 99 and 146 lower than 391. Therefore, our halfway between answer of 245 above is correct.
Halfway Between
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Halfway Between 99 and 392
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