When you ask "What number is halfway between 81 and 868?" 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=868.
To find the number halfway between 81 and 868, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 81 and 868 into our formula, we get:
(81 + 868)/2 = 474.5
Thus, the number halfway between 81 and 868 is 474.5.
To check that our answer is correct, we subtract 81 from 474.5 and subtract 474.5 from 868 and compare the two numbers:
474.5 - 81 = 393.5
868 - 474.5 = 393.5
As you can see, the halfway number is 393.5 higher than 81 and 393.5 lower than 868. Therefore, our halfway between answer of 474.5 above is correct.
Halfway Between
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Halfway Between 81 and 869
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