Halfway Between 15 and 20

When you ask "What number is halfway between 15 and 20?" 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=20.

Halfway Between Line

To find the number halfway between 15 and 20, we use the following formula:

(X + Y)/2 = Halfway Between

When we enter 15 and 20 into our formula, we get:

(15 + 20)/2 = 17.5

Thus, the number halfway between 15 and 20 is 17.5.

To check that our answer is correct, we subtract 15 from 17.5 and subtract 17.5 from 20 and compare the two numbers:

17.5 - 15 = 2.5
20 - 17.5 = 2.5

As you can see, the halfway number is 2.5 higher than 15 and 2.5 lower than 20. Therefore, our halfway between answer of 17.5 above is correct.

Halfway Between
Find halfway between two other numbers here!

Halfway Between 15 and 21
Here is our next Halfway Between calculation.