When you ask "What number is halfway between 18 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=18 and Y=389.
To find the number halfway between 18 and 389, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 18 and 389 into our formula, we get:
(18 + 389)/2 = 203.5
Thus, the number halfway between 18 and 389 is 203.5.
To check that our answer is correct, we subtract 18 from 203.5 and subtract 203.5 from 389 and compare the two numbers:
203.5 - 18 = 185.5
389 - 203.5 = 185.5
As you can see, the halfway number is 185.5 higher than 18 and 185.5 lower than 389. Therefore, our halfway between answer of 203.5 above is correct.
Halfway Between
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Halfway Between 18 and 390
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