When you ask "What number is halfway between 11 and 880?" 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=880.
To find the number halfway between 11 and 880, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 11 and 880 into our formula, we get:
(11 + 880)/2 = 445.5
Thus, the number halfway between 11 and 880 is 445.5.
To check that our answer is correct, we subtract 11 from 445.5 and subtract 445.5 from 880 and compare the two numbers:
445.5 - 11 = 434.5
880 - 445.5 = 434.5
As you can see, the halfway number is 434.5 higher than 11 and 434.5 lower than 880. Therefore, our halfway between answer of 445.5 above is correct.
Halfway Between
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Halfway Between 11 and 881
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