Let's divide 808969 by 91
The aim is to understand the frequency of 91 in 808969.

On to step 1:
When dividing 8 by 91, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 91

Going ahead to step 2:
When dividing 80 by 91, we get 0 with a remainder of 80.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 80, we end up with 80.
Bring next digit (8) of the dividend behind the 80 and repeat the process: 808 / 91

On to step 3:
91 can be fit into 808 8 times, resulting in a remainder of 80.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we subtract 728 from 808, we get 80.
Bring next digit (9) of the dividend behind the 80 and repeat the process: 809 / 91

Going ahead to step 4:
The number 91 fits into 809 8 times, leaving a remainder of 81.
Record the quotient 8 as the next digit in the result. 
Result so far: 88.0
Subtract 728 from 809 to get 81.
Bring next digit (6) of the dividend behind the 81 and repeat the process: 816 / 91

On to step 5:
When dividing 816 by 91, we get 8 with a remainder of 88.
Write down 8 as next digit of the result. 
Result so far: 888.0
Subtract 728 from 816 to get 88.
Take the next digit (9) from the dividend and append it to 88, then repeat: 889 / 91

Let's proceed to step 6:
91 can be fit into 889 9 times, resulting in a remainder of 70.
Put 9 as the next digit of the answer. 
Result so far: 8889.0
If we subtract 819 from 889, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Let's proceed to step 7:
The number 91 fits into 700 7 times, leaving a remainder of 63.
Put 7 as the next digit of the answer. 
Result so far: 8889.7
If we subtract 637 from 700, we get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Advancing to step 8:
630 divided by 91 is 6 with a remainder of 84.
Record the quotient 6 as the next digit in the result. 
Result so far: 8889.76
If we subtract 546 from 630, we get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 9:
When dividing 840 by 91, we get 9 with a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 8889.769
If we take 819 away from 840, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 10:
The number 91 fits into 210 2 times, leaving a remainder of 28.
Put 2 as the next digit of the answer. 
Result so far: 8889.7692
Subtracting 182 from 210 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 11:
If we divide 280 by 91, we get 3 and a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 8889.76923
Subtracting 273 from 280 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 12:
When dividing 70 by 91, we get 0 with a remainder of 70.
Write down 0 as next digit of the result. 
Result so far: 8889.76923
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Advancing to step 13:
The number 91 fits into 700 7 times, leaving a remainder of 63.
The next digit of our result is 7. 
Result so far: 8889.7692307
Deduct 637 from 700 and we're left with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Step 14:
91 can be fit into 630 6 times, resulting in a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 8889.76923076
If we subtract 546 from 630, we get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

The final result is 8889.76923076 with a remainder of 8.4e-08.