We look at the division of 16801199 by 91 
The aim is to understand the frequency of 91 in 16801199.

Step 1:
The number 91 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 91

On to step 2:
When dividing 16 by 91, we get 0 with a remainder of 16.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 16 and we're left with 16.
Bring next digit (8) of the dividend behind the 16 and repeat the process: 168 / 91

Moving on to step 3:
The number 91 fits into 168 1 times, leaving a remainder of 77.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 91 from 168 and we're left with 77.
Fetch the next digit (0) from the dividend, attach it to 77 and continue: 770 / 91

Advancing to step 4:
When dividing 770 by 91, we get 8 with a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 18.0
The remainder is 42 after subtracting 728 from 770.
Append the next digit (1) from the dividend to 42 and continue with: 421 / 91

Going ahead to step 5:
91 goes into 421 4 times with a remainder of 57.
Use 4 as the next digit of our solution. 
Result so far: 184.0
If we take 364 away from 421, we end up with 57.
Append the next digit (1) from the dividend to 57 and continue with: 571 / 91

On to step 6:
91 goes into 571 6 times with a remainder of 25.
The number 6 becomes the next digit in our result. 
Result so far: 1846.0
The remainder is 25 after subtracting 546 from 571.
Include the next digit (9) from the dividend after 25, then repeat: 259 / 91

Step 7:
91 goes into 259 2 times with a remainder of 77.
The next digit of our result is 2. 
Result so far: 18462.0
Subtracting 182 from 259 leaves us with 77.
Fetch the next digit (9) from the dividend, attach it to 77 and continue: 779 / 91

On to step 8:
The number 91 fits into 779 8 times, leaving a remainder of 51.
The next digit of our result is 8. 
Result so far: 184628.0
If we subtract 728 from 779, we get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Step 9:
91 goes into 510 5 times with a remainder of 55.
The next digit of our result is 5. 
Result so far: 184628.5
The remainder is 55 after subtracting 455 from 510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 10:
91 can be fit into 550 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 184628.56
The remainder is 4 after subtracting 546 from 550.
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 11:
91 can be fit into 40 0 times, resulting in a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 184628.56
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 12:
400 divided by 91 is 4 with a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 184628.5604
Deduct 364 from 400 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 13:
91 goes into 360 3 times with a remainder of 87.
The number 3 becomes the next digit in our result. 
Result so far: 184628.56043
Deduct 273 from 360 and we're left with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 14:
If we divide 870 by 91, we get 9 and a remainder of 51.
The number 9 becomes the next digit in our result. 
Result so far: 184628.560439
If we take 819 away from 870, we end up with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Let's proceed to step 15:
When dividing 510 by 91, we get 5 with a remainder of 55.
Write down 5 as next digit of the result. 
Result so far: 184628.5604395
Subtract 455 from 510 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Going ahead to step 16:
If we divide 550 by 91, we get 6 and a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 184628.56043956
Subtracting 546 from 550 leaves us 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.

The quotient of the division is 184628.56043956, and the remainder is 4e-09.