We look at the division of 291199 by 15 
The aim is to understand the frequency of 15 in 291199.

Going ahead to step 1:
The number 15 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Bring next digit (9) of the dividend behind the 2 and repeat the process: 29 / 15

Going ahead to step 2:
The number 15 fits into 29 1 times, leaving a remainder of 14.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 15 from 29 leaves us with 14.
Take the next digit (1) from the dividend and append it to 14, then repeat: 141 / 15

Step 3:
15 goes into 141 9 times with a remainder of 6.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
Subtract 135 from 141 to get 6.
Bring next digit (1) of the dividend behind the 6 and repeat the process: 61 / 15

Moving on to step 4:
61 divided by 15 is 4 with a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 194.0
Subtracting 60 from 61 leaves us with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 15

Let's proceed to step 5:
If we divide 19 by 15, we get 1 and a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 1941.0
Subtract 15 from 19 to get 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 15

Let's proceed to step 6:
If we divide 49 by 15, we get 3 and a remainder of 4.
Use 3 as the next digit of our solution. 
Result so far: 19413.0
If we take 45 away from 49, we end up 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.

On to step 7:
15 goes into 40 2 times with a remainder of 10.
The next digit of our result is 2. 
Result so far: 19413.2
Subtracting 30 from 40 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.

Moving on to step 8:
When dividing 100 by 15, we get 6 with a remainder of 10.
The number 6 becomes the next digit in our result. 
Result so far: 19413.26
If we take 90 away from 100, we end up 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.

On to step 9:
When dividing 100 by 15, we get 6 with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 19413.266
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.

The final outcome is 19413.266, with a leftover of 0.001.