Halfway Between 30 and 680

When you ask "What number is halfway between 30 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=30 and Y=680.

Halfway Between Line

To find the number halfway between 30 and 680, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 30 and 680 into our formula, we get:

(30 + 680)/2 = 355

Thus, the number halfway between 30 and 680 is 355.

To check that our answer is correct, we subtract 30 from 355 and subtract 355 from 680 and compare the two numbers:

355 - 30 = 325
680 - 355 = 325

As you can see, the halfway number is 325 higher than 30 and 325 lower than 680. Therefore, our halfway between answer of 355 above is correct.

Halfway Between
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