When you ask "What number is halfway between 84 and 891?" 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=891.
To find the number halfway between 84 and 891, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 891 into our formula, we get:
(84 + 891)/2 = 487.5
Thus, the number halfway between 84 and 891 is 487.5.
To check that our answer is correct, we subtract 84 from 487.5 and subtract 487.5 from 891 and compare the two numbers:
487.5 - 84 = 403.5
891 - 487.5 = 403.5
As you can see, the halfway number is 403.5 higher than 84 and 403.5 lower than 891. Therefore, our halfway between answer of 487.5 above is correct.
Halfway Between
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Halfway Between 84 and 892
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