When you ask "What number is halfway between 81 and 876?" 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=876.
To find the number halfway between 81 and 876, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 876 into our formula, we get:
(81 + 876)/2 = 478.5
Thus, the number halfway between 81 and 876 is 478.5.
To check that our answer is correct, we subtract 81 from 478.5 and subtract 478.5 from 876 and compare the two numbers:
478.5 - 81 = 397.5
876 - 478.5 = 397.5
As you can see, the halfway number is 397.5 higher than 81 and 397.5 lower than 876. Therefore, our halfway between answer of 478.5 above is correct.
Halfway Between
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Halfway Between 81 and 877
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