Halfway Between 30 and 688

When you ask "What number is halfway between 30 and 688?" 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=688.

Halfway Between Line

To find the number halfway between 30 and 688, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 30 and 688 into our formula, we get:

(30 + 688)/2 = 359

Thus, the number halfway between 30 and 688 is 359.

To check that our answer is correct, we subtract 30 from 359 and subtract 359 from 688 and compare the two numbers:

359 - 30 = 329
688 - 359 = 329

As you can see, the halfway number is 329 higher than 30 and 329 lower than 688. Therefore, our halfway between answer of 359 above is correct.

Halfway Between
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