Halfway Between 1 and 21

When you ask "What number is halfway between 1 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=1 and Y=21.

Halfway Between Line

To find the number halfway between 1 and 21, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 1 and 21 into our formula, we get:

(1 + 21)/2 = 11

Thus, the number halfway between 1 and 21 is 11.

To check that our answer is correct, we subtract 1 from 11 and subtract 11 from 21 and compare the two numbers:

11 - 1 = 10
21 - 11 = 10

As you can see, the halfway number is 10 higher than 1 and 10 lower than 21. Therefore, our halfway between answer of 11 above is correct.

Halfway Between
Find halfway between two other numbers here!

Halfway Between 1 and 22
Here is our next Halfway Between calculation.