We divide 233899 by 15
The aim is to understand the frequency of 15 in 233899.

Step 1:
When dividing 2 by 15, we get 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 15

Moving on to step 2:
15 goes into 23 1 times with a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 15 from 23, we get 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 15

Let's proceed to step 3:
If we divide 83 by 15, we get 5 and a remainder of 8.
Write down 5 as next digit of the result. 
Result so far: 15.0
If we subtract 75 from 83, we get 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 15

Advancing to step 4:
If we divide 88 by 15, we get 5 and a remainder of 13.
Use 5 as the next digit of our solution. 
Result so far: 155.0
If we take 75 away from 88, we end up with 13.
Include the next digit (9) from the dividend after 13, then repeat: 139 / 15

On to step 5:
15 can be fit into 139 9 times, resulting in a remainder of 4.
The next digit of our result is 9. 
Result so far: 1559.0
Subtracting 135 from 139 leaves us with 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 15

Let's proceed to step 6:
The number 15 fits into 49 3 times, leaving a remainder of 4.
The number 3 becomes the next digit in our result. 
Result so far: 15593.0
Deduct 45 from 49 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 7:
When dividing 40 by 15, we get 2 with a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 15593.2
Deduct 30 from 40 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
100 divided by 15 is 6 with a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 15593.26
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
15 can be fit into 100 6 times, resulting in a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 15593.266
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

In conclusion, the division gives 15593.266 with a balance of 0.001.