When you ask "What number is halfway between 88 and 687?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=88 and Y=687.
To find the number halfway between 88 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 88 and 687 into our formula, we get:
(88 + 687)/2 = 387.5
Thus, the number halfway between 88 and 687 is 387.5.
To check that our answer is correct, we subtract 88 from 387.5 and subtract 387.5 from 687 and compare the two numbers:
387.5 - 88 = 299.5
687 - 387.5 = 299.5
As you can see, the halfway number is 299.5 higher than 88 and 299.5 lower than 687. Therefore, our halfway between answer of 387.5 above is correct.
Halfway Between
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Halfway Between 88 and 688
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