When you ask "What number is halfway between 100 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=100 and Y=687.
To find the number halfway between 100 and 687, we use the following formula:
(X + Y)/2 = Halfway Between
When we enter 100 and 687 into our formula, we get:
(100 + 687)/2 = 393.5
Thus, the number halfway between 100 and 687 is 393.5.
To check that our answer is correct, we subtract 100 from 393.5 and subtract 393.5 from 687 and compare the two numbers:
393.5 - 100 = 293.5
687 - 393.5 = 293.5
As you can see, the halfway number is 293.5 higher than 100 and 293.5 lower than 687. Therefore, our halfway between answer of 393.5 above is correct.
Halfway Between
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Halfway Between 100 and 688
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