Halfway Between 15 and 643

When you ask "What number is halfway between 15 and 643?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=15 and Y=643.

Halfway Between Line

To find the number halfway between 15 and 643, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 15 and 643 into our formula, we get:

(15 + 643)/2 = 329

Thus, the number halfway between 15 and 643 is 329.

To check that our answer is correct, we subtract 15 from 329 and subtract 329 from 643 and compare the two numbers:

329 - 15 = 314
643 - 329 = 314

As you can see, the halfway number is 314 higher than 15 and 314 lower than 643. Therefore, our halfway between answer of 329 above is correct.

Halfway Between
Find halfway between two other numbers here!

Halfway Between 15 and 644
Here is our next Halfway Between calculation.