When you ask "What number is halfway between 99 and 308?" 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=308.
To find the number halfway between 99 and 308, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 308 into our formula, we get:
(99 + 308)/2 = 203.5
Thus, the number halfway between 99 and 308 is 203.5.
To check that our answer is correct, we subtract 99 from 203.5 and subtract 203.5 from 308 and compare the two numbers:
203.5 - 99 = 104.5
308 - 203.5 = 104.5
As you can see, the halfway number is 104.5 higher than 99 and 104.5 lower than 308. Therefore, our halfway between answer of 203.5 above is correct.
Halfway Between
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Halfway Between 99 and 309
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