When you ask "What number is halfway between 99 and 389?" 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=389.
To find the number halfway between 99 and 389, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 99 and 389 into our formula, we get:
(99 + 389)/2 = 244
Thus, the number halfway between 99 and 389 is 244.
To check that our answer is correct, we subtract 99 from 244 and subtract 244 from 389 and compare the two numbers:
244 - 99 = 145
389 - 244 = 145
As you can see, the halfway number is 145 higher than 99 and 145 lower than 389. Therefore, our halfway between answer of 244 above is correct.
Halfway Between
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Halfway Between 99 and 390
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