Halfway Between 2 and 21

When you ask "What number is halfway between 2 and 21?" we assume you mean the number in the exact middle of the two numbers on a number line, as illustrated below, where X=2 and Y=21.

Halfway Between Line

To find the number halfway between 2 and 21, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 2 and 21 into our formula, we get:

(2 + 21)/2 = 11.5

Thus, the number halfway between 2 and 21 is 11.5.

To check that our answer is correct, we subtract 2 from 11.5 and subtract 11.5 from 21 and compare the two numbers:

11.5 - 2 = 9.5
21 - 11.5 = 9.5

As you can see, the halfway number is 9.5 higher than 2 and 9.5 lower than 21. Therefore, our halfway between answer of 11.5 above is correct.

Halfway Between
Find halfway between two other numbers here!

Halfway Between 2 and 22
Here is our next Halfway Between calculation.