When you ask "What number is halfway between 99 and 331?" 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=331.
To find the number halfway between 99 and 331, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 331 into our formula, we get:
(99 + 331)/2 = 215
Thus, the number halfway between 99 and 331 is 215.
To check that our answer is correct, we subtract 99 from 215 and subtract 215 from 331 and compare the two numbers:
215 - 99 = 116
331 - 215 = 116
As you can see, the halfway number is 116 higher than 99 and 116 lower than 331. Therefore, our halfway between answer of 215 above is correct.
Halfway Between
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Halfway Between 99 and 332
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