When you ask "What number is halfway between 84 and 858?" 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=858.
To find the number halfway between 84 and 858, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 84 and 858 into our formula, we get:
(84 + 858)/2 = 471
Thus, the number halfway between 84 and 858 is 471.
To check that our answer is correct, we subtract 84 from 471 and subtract 471 from 858 and compare the two numbers:
471 - 84 = 387
858 - 471 = 387
As you can see, the halfway number is 387 higher than 84 and 387 lower than 858. Therefore, our halfway between answer of 471 above is correct.
Halfway Between
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Halfway Between 84 and 859
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