We look at the division of 806961 by 91 
The aim is to understand the frequency of 91 in 806961.

Let's proceed to step 1:
8 divided by 91 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Bring next digit (0) of the dividend behind the 8 and repeat the process: 80 / 91

Going ahead to step 2:
91 goes into 80 0 times with a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 80, we end up with 80.
Grab the next digit (6) from the dividend, add it to 80, then carry on: 806 / 91

Advancing to step 3:
The number 91 fits into 806 8 times, leaving a remainder of 78.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 728 from 806, we get 78.
Grab the next digit (9) from the dividend, add it to 78, then carry on: 789 / 91

Moving on to step 4:
91 goes into 789 8 times with a remainder of 61.
Use 8 as the next digit of our solution. 
Result so far: 88.0
The remainder is 61 after subtracting 728 from 789.
Include the next digit (6) from the dividend after 61, then repeat: 616 / 91

Going ahead to step 5:
91 goes into 616 6 times with a remainder of 70.
Put 6 as the next digit of the answer. 
Result so far: 886.0
Subtracting 546 from 616 leaves us with 70.
Include the next digit (1) from the dividend after 70, then repeat: 701 / 91

On to step 6:
When dividing 701 by 91, we get 7 with a remainder of 64.
The next digit of our result is 7. 
Result so far: 8867.0
If we subtract 637 from 701, we get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 7:
91 can be fit into 640 7 times, resulting in a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 8867.7
The remainder is 3 after subtracting 637 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 8:
91 goes into 30 0 times with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 8867.7
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Moving on to step 9:
300 divided by 91 is 3 with a remainder of 27.
The number 3 becomes the next digit in our result. 
Result so far: 8867.703
Subtracting 273 from 300 leaves us with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Advancing to step 10:
91 goes into 270 2 times with a remainder of 88.
The next digit of our result is 2. 
Result so far: 8867.7032
If we subtract 182 from 270, we get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Going ahead to step 11:
The number 91 fits into 880 9 times, leaving a remainder of 61.
Put 9 as the next digit of the answer. 
Result so far: 8867.70329
Subtracting 819 from 880 leaves us with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Advancing to step 12:
91 goes into 610 6 times with a remainder of 64.
The number 6 becomes the next digit in our result. 
Result so far: 8867.703296
Subtract 546 from 610 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 13:
91 goes into 640 7 times with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 8867.7032967
Subtract 637 from 640 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 14:
The number 91 fits into 30 0 times, leaving a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 8867.7032967
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

The final outcome is 8867.7032967, with a leftover of 3e-08.