When you ask "What number is halfway between 30 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=30 and Y=687.
To find the number halfway between 30 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 30 and 687 into our formula, we get:
(30 + 687)/2 = 358.5
Thus, the number halfway between 30 and 687 is 358.5.
To check that our answer is correct, we subtract 30 from 358.5 and subtract 358.5 from 687 and compare the two numbers:
358.5 - 30 = 328.5
687 - 358.5 = 328.5
As you can see, the halfway number is 328.5 higher than 30 and 328.5 lower than 687. Therefore, our halfway between answer of 358.5 above is correct.
Halfway Between
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Halfway Between 30 and 688
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