When you ask "What number is halfway between 84 and 879?" 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=879.
To find the number halfway between 84 and 879, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 879 into our formula, we get:
(84 + 879)/2 = 481.5
Thus, the number halfway between 84 and 879 is 481.5.
To check that our answer is correct, we subtract 84 from 481.5 and subtract 481.5 from 879 and compare the two numbers:
481.5 - 84 = 397.5
879 - 481.5 = 397.5
As you can see, the halfway number is 397.5 higher than 84 and 397.5 lower than 879. Therefore, our halfway between answer of 481.5 above is correct.
Halfway Between
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Halfway Between 84 and 880
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