When you ask "What number is halfway between 81 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=81 and Y=880.
To find the number halfway between 81 and 880, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 880 into our formula, we get:
(81 + 880)/2 = 480.5
Thus, the number halfway between 81 and 880 is 480.5.
To check that our answer is correct, we subtract 81 from 480.5 and subtract 480.5 from 880 and compare the two numbers:
480.5 - 81 = 399.5
880 - 480.5 = 399.5
As you can see, the halfway number is 399.5 higher than 81 and 399.5 lower than 880. Therefore, our halfway between answer of 480.5 above is correct.
Halfway Between
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Halfway Between 81 and 881
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