We look at the division of 855013 by 91 
The aim is to understand the frequency of 91 in 855013.

Let's proceed to step 1:
8 divided by 91 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 91

Moving on to step 2:
91 goes into 85 0 times with a remainder of 85.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 85 to get 85.
Grab the next digit (5) from the dividend, add it to 85, then carry on: 855 / 91

Going ahead to step 3:
When dividing 855 by 91, we get 9 with a remainder of 36.
The next digit of our result is 9. 
Result so far: 9.0
Subtracting 819 from 855 leaves us with 36.
Bring next digit (0) of the dividend behind the 36 and repeat the process: 360 / 91

On to step 4:
The number 91 fits into 360 3 times, leaving a remainder of 87.
The next digit of our result is 3. 
Result so far: 93.0
Subtract 273 from 360 to get 87.
Append the next digit (1) from the dividend to 87 and continue with: 871 / 91

Step 5:
If we divide 871 by 91, we get 9 and a remainder of 52.
Record the quotient 9 as the next digit in the result. 
Result so far: 939.0
Subtracting 819 from 871 leaves us with 52.
Fetch the next digit (3) from the dividend, attach it to 52 and continue: 523 / 91

Going ahead to step 6:
91 can be fit into 523 5 times, resulting in a remainder of 68.
The number 5 becomes the next digit in our result. 
Result so far: 9395.0
If we subtract 455 from 523, we get 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 7:
When dividing 680 by 91, we get 7 with a remainder of 43.
The number 7 becomes the next digit in our result. 
Result so far: 9395.7
If we take 637 away from 680, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 8:
91 goes into 430 4 times with a remainder of 66.
Record the quotient 4 as the next digit in the result. 
Result so far: 9395.74
The remainder is 66 after subtracting 364 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 9:
91 goes into 660 7 times with a remainder of 23.
Put 7 as the next digit of the answer. 
Result so far: 9395.747
The remainder is 23 after subtracting 637 from 660.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

On to step 10:
The number 91 fits into 230 2 times, leaving a remainder of 48.
Use 2 as the next digit of our solution. 
Result so far: 9395.7472
Subtracting 182 from 230 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 11:
91 can be fit into 480 5 times, resulting in a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 9395.74725
Deduct 455 from 480 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 12:
The number 91 fits into 250 2 times, leaving a remainder of 68.
The next digit of our result is 2. 
Result so far: 9395.747252
If we take 182 away from 250, we end up with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

On to step 13:
If we divide 680 by 91, we get 7 and a remainder of 43.
Record the quotient 7 as the next digit in the result. 
Result so far: 9395.7472527
If we take 637 away from 680, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 14:
The number 91 fits into 430 4 times, leaving a remainder of 66.
Use 4 as the next digit of our solution. 
Result so far: 9395.74725274
Deduct 364 from 430 and we're left with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

The final outcome is 9395.74725274, with a leftover of 6.6e-08.