Halfway Between 100 and 680

When you ask "What number is halfway between 100 and 680?" 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=680.

Halfway Between Line

To find the number halfway between 100 and 680, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 100 and 680 into our formula, we get:

(100 + 680)/2 = 390

Thus, the number halfway between 100 and 680 is 390.

To check that our answer is correct, we subtract 100 from 390 and subtract 390 from 680 and compare the two numbers:

390 - 100 = 290
680 - 390 = 290

As you can see, the halfway number is 290 higher than 100 and 290 lower than 680. Therefore, our halfway between answer of 390 above is correct.

Halfway Between
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