When you ask "What number is halfway between 81 and 888?" 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=888.
To find the number halfway between 81 and 888, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 888 into our formula, we get:
(81 + 888)/2 = 484.5
Thus, the number halfway between 81 and 888 is 484.5.
To check that our answer is correct, we subtract 81 from 484.5 and subtract 484.5 from 888 and compare the two numbers:
484.5 - 81 = 403.5
888 - 484.5 = 403.5
As you can see, the halfway number is 403.5 higher than 81 and 403.5 lower than 888. Therefore, our halfway between answer of 484.5 above is correct.
Halfway Between
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Halfway Between 81 and 889
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