
When you ask "What number is halfway between 71 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=71 and Y=389.

To find the number halfway between 71 and 389, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 71 and 389 into our formula, we get:
(71 + 389)/2 = 230
Thus, the number halfway between 71 and 389 is 230.
To check that our answer is correct, we subtract 71 from 230 and subtract 230 from 389 and compare the two numbers:
230 - 71 = 159
389 - 230 = 159
As you can see, the halfway number is 159 higher than 71 and 159 lower than 389. Therefore, our halfway between answer of 230 above is correct.
Halfway Between
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Halfway Between 71 and 390
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