When you ask "What number is halfway between 84 and 861?" 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=861.
To find the number halfway between 84 and 861, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 861 into our formula, we get:
(84 + 861)/2 = 472.5
Thus, the number halfway between 84 and 861 is 472.5.
To check that our answer is correct, we subtract 84 from 472.5 and subtract 472.5 from 861 and compare the two numbers:
472.5 - 84 = 388.5
861 - 472.5 = 388.5
As you can see, the halfway number is 388.5 higher than 84 and 388.5 lower than 861. Therefore, our halfway between answer of 472.5 above is correct.
Halfway Between
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Halfway Between 84 and 862
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