When you ask "What number is halfway between 84 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=84 and Y=389.
To find the number halfway between 84 and 389, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 389 into our formula, we get:
(84 + 389)/2 = 236.5
Thus, the number halfway between 84 and 389 is 236.5.
To check that our answer is correct, we subtract 84 from 236.5 and subtract 236.5 from 389 and compare the two numbers:
236.5 - 84 = 152.5
389 - 236.5 = 152.5
As you can see, the halfway number is 152.5 higher than 84 and 152.5 lower than 389. Therefore, our halfway between answer of 236.5 above is correct.
Halfway Between
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Halfway Between 84 and 390
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