When you ask "What number is halfway between 11 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=11 and Y=858.
To find the number halfway between 11 and 858, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 858 into our formula, we get:
(11 + 858)/2 = 434.5
Thus, the number halfway between 11 and 858 is 434.5.
To check that our answer is correct, we subtract 11 from 434.5 and subtract 434.5 from 858 and compare the two numbers:
434.5 - 11 = 423.5
858 - 434.5 = 423.5
As you can see, the halfway number is 423.5 higher than 11 and 423.5 lower than 858. Therefore, our halfway between answer of 434.5 above is correct.
Halfway Between
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Halfway Between 11 and 859
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