Halfway Between 100 and 678

When you ask "What number is halfway between 100 and 678?" 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=678.

Halfway Between Line

To find the number halfway between 100 and 678, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 100 and 678 into our formula, we get:

(100 + 678)/2 = 389

Thus, the number halfway between 100 and 678 is 389.

To check that our answer is correct, we subtract 100 from 389 and subtract 389 from 678 and compare the two numbers:

389 - 100 = 289
678 - 389 = 289

As you can see, the halfway number is 289 higher than 100 and 289 lower than 678. Therefore, our halfway between answer of 389 above is correct.

Halfway Between
Find halfway between two other numbers here!

Halfway Between 100 and 679
Here is our next Halfway Between calculation.