When you ask "What number is halfway between 87 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=87 and Y=868.
To find the number halfway between 87 and 868, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 868 into our formula, we get:
(87 + 868)/2 = 477.5
Thus, the number halfway between 87 and 868 is 477.5.
To check that our answer is correct, we subtract 87 from 477.5 and subtract 477.5 from 868 and compare the two numbers:
477.5 - 87 = 390.5
868 - 477.5 = 390.5
As you can see, the halfway number is 390.5 higher than 87 and 390.5 lower than 868. Therefore, our halfway between answer of 477.5 above is correct.
Halfway Between
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Halfway Between 87 and 869
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