# FAQ: Calculating Churn - What is Churn?

This community-built FAQ covers the “What is Churn?” exercise from the lesson “Calculating Churn”.

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This exercise can be found in the following Codecademy content:

## FAQs on the exercise What is Churn?

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select 100./2000 ;

why dot is used after 100 in the churn project for calculating percentage

Moreover , i want to know whether we can do all type of calculation in this way?

3 Likes

The dot makes the decimals visible in the result.

SELECT 100./2000; – will give you 0.05 as a result

SELECT 100/2000; – without the dot the result is 0

You can calculate mathematical values using SELECT by using the common mathematical operators such as addition (+), subtraction (-), multiplication (*), division (/).

However you can try it from your sqlite command prompt.

Instructions on how to install SQLite:

And then you can run git-bash from the Start Menu, if you are using Windows.

4 Likes

This sounds like a basic question but I don’t get why my calc is wrong

SELECT 450. / (3000 + 500);

3000 base, plus 500 in the same period. Lost 450. The question is suggesting SELECT 450. / 3000;. What happened to the + 500?

5 Likes

Since we’re calculating April’s churn rate, any number of users added during April is not counted when calculating churn.

Only the one’s lost.

They’re trying to trick us

4 Likes