When you ask "What number is halfway between 81 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=81 and Y=858.
To find the number halfway between 81 and 858, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 858 into our formula, we get:
(81 + 858)/2 = 469.5
Thus, the number halfway between 81 and 858 is 469.5.
To check that our answer is correct, we subtract 81 from 469.5 and subtract 469.5 from 858 and compare the two numbers:
469.5 - 81 = 388.5
858 - 469.5 = 388.5
As you can see, the halfway number is 388.5 higher than 81 and 388.5 lower than 858. Therefore, our halfway between answer of 469.5 above is correct.
Halfway Between
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Halfway Between 81 and 859
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