We divide 13593 by 9
The aim is to understand the frequency of 9 in 13593.

On to step 1:
If we divide 1 by 9, we get 0 and a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Include the next digit (3) from the dividend after 1, then repeat: 13 / 9

On to step 2:
If we divide 13 by 9, we get 1 and a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 9 away from 13, we end up with 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 9

Moving on to step 3:
45 divided by 9 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 15.0
If we subtract 45 from 45, we get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 9

Going ahead to step 4:
9 goes into 9 1 times with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 151.0
Subtracting 9 from 9 leaves us with 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 9

Moving on to step 5:
When dividing 3 by 9, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 1510.0
Subtracting 0 from 3 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 6:
When dividing 30 by 9, we get 3 with a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 1510.3
If we take 27 away from 30, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
The number 9 fits into 30 3 times, leaving a remainder of 3.
Use 3 as the next digit of our solution. 
Result so far: 1510.33
If we take 27 away from 30, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 1510.33, with a leftover of 0.003.