We look at the division of 30459206 by 91 
The aim is to understand the frequency of 91 in 30459206.

Step 1:
3 divided by 91 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 91

Step 2:
91 goes into 30 0 times with a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 30 after subtracting 0 from 30.
Grab the next digit (4) from the dividend, add it to 30, then carry on: 304 / 91

Let's proceed to step 3:
If we divide 304 by 91, we get 3 and a remainder of 31.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtracting 273 from 304 leaves us with 31.
Include the next digit (5) from the dividend after 31, then repeat: 315 / 91

Let's proceed to step 4:
When dividing 315 by 91, we get 3 with a remainder of 42.
Use 3 as the next digit of our solution. 
Result so far: 33.0
Subtract 273 from 315 to get 42.
Fetch the next digit (9) from the dividend, attach it to 42 and continue: 429 / 91

On to step 5:
The number 91 fits into 429 4 times, leaving a remainder of 65.
The next digit of our result is 4. 
Result so far: 334.0
Subtract 364 from 429 to get 65.
Append the next digit (2) from the dividend to 65 and continue with: 652 / 91

Advancing to step 6:
91 goes into 652 7 times with a remainder of 15.
Write down 7 as next digit of the result. 
Result so far: 3347.0
If we subtract 637 from 652, we get 15.
Fetch the next digit (0) from the dividend, attach it to 15 and continue: 150 / 91

Advancing to step 7:
The number 91 fits into 150 1 times, leaving a remainder of 59.
The next digit of our result is 1. 
Result so far: 33471.0
Deduct 91 from 150 and we're left with 59.
Append the next digit (6) from the dividend to 59 and continue with: 596 / 91

Moving on to step 8:
When dividing 596 by 91, we get 6 with a remainder of 50.
Use 6 as the next digit of our solution. 
Result so far: 334716.0
If we subtract 546 from 596, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 9:
When dividing 500 by 91, we get 5 with a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 334716.5
If we take 455 away from 500, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Step 10:
The number 91 fits into 450 4 times, leaving a remainder of 86.
Use 4 as the next digit of our solution. 
Result so far: 334716.54
Subtracting 364 from 450 leaves us with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 11:
When dividing 860 by 91, we get 9 with a remainder of 41.
The number 9 becomes the next digit in our result. 
Result so far: 334716.549
If we subtract 819 from 860, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 12:
If we divide 410 by 91, we get 4 and a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 334716.5494
Subtract 364 from 410 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Going ahead to step 13:
When dividing 460 by 91, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 334716.54945
Deduct 455 from 460 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 14:
The number 91 fits into 50 0 times, leaving a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 334716.54945
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 15:
When dividing 500 by 91, we get 5 with a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 334716.5494505
Subtract 455 from 500 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

On to step 16:
450 divided by 91 is 4 with a remainder of 86.
Put 4 as the next digit of the answer. 
Result so far: 334716.54945054
If we take 364 away from 450, we end up with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

After the division, we end up with 334716.54945054 and a remainder of 8.6e-08.