We look at the division of 65321 by 91 
The aim is to understand the frequency of 91 in 65321.

Advancing to step 1:
If we divide 6 by 91, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 91

Advancing to step 2:
When dividing 65 by 91, we get 0 with a remainder of 65.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 65, we end up with 65.
Append the next digit (3) from the dividend to 65 and continue with: 653 / 91

Step 3:
If we divide 653 by 91, we get 7 and a remainder of 16.
The next digit of our result is 7. 
Result so far: 7.0
The remainder is 16 after subtracting 637 from 653.
Grab the next digit (2) from the dividend, add it to 16, then carry on: 162 / 91

Moving on to step 4:
162 divided by 91 is 1 with a remainder of 71.
Record the quotient 1 as the next digit in the result. 
Result so far: 71.0
If we take 91 away from 162, we end up with 71.
Append the next digit (1) from the dividend to 71 and continue with: 711 / 91

Going ahead to step 5:
711 divided by 91 is 7 with a remainder of 74.
The next digit of our result is 7. 
Result so far: 717.0
Subtract 637 from 711 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 6:
When dividing 740 by 91, we get 8 with a remainder of 12.
The next digit of our result is 8. 
Result so far: 717.8
Subtract 728 from 740 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 7:
91 goes into 120 1 times with a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 717.81
Subtract 91 from 120 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 8:
91 can be fit into 290 3 times, resulting in a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 717.813
If we subtract 273 from 290, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 9:
When dividing 170 by 91, we get 1 with a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 717.8131
Deduct 91 from 170 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Let's proceed to step 10:
If we divide 790 by 91, we get 8 and a remainder of 62.
Write down 8 as next digit of the result. 
Result so far: 717.81318
Deduct 728 from 790 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 11:
91 goes into 620 6 times with a remainder of 74.
Put 6 as the next digit of the answer. 
Result so far: 717.813186
If we take 546 away from 620, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Step 12:
91 goes into 740 8 times with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 717.8131868
Subtracting 728 from 740 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 13:
120 divided by 91 is 1 with a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 717.81318681
If we subtract 91 from 120, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final result is 717.81318681 with a remainder of 2.9e-08.