When you ask "What number is halfway between 87 and 668?" 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=668.
To find the number halfway between 87 and 668, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 87 and 668 into our formula, we get:
(87 + 668)/2 = 377.5
Thus, the number halfway between 87 and 668 is 377.5.
To check that our answer is correct, we subtract 87 from 377.5 and subtract 377.5 from 668 and compare the two numbers:
377.5 - 87 = 290.5
668 - 377.5 = 290.5
As you can see, the halfway number is 290.5 higher than 87 and 290.5 lower than 668. Therefore, our halfway between answer of 377.5 above is correct.
Halfway Between
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