We look at the division of 122579 by 91 
The aim is to understand the frequency of 91 in 122579.

Moving on to step 1:
1 divided by 91 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (2) from the dividend to 1 and continue with: 12 / 91

Step 2:
If we divide 12 by 91, we get 0 and a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Bring next digit (2) of the dividend behind the 12 and repeat the process: 122 / 91

Moving on to step 3:
91 goes into 122 1 times with a remainder of 31.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 91 from 122 leaves us with 31.
Append the next digit (5) from the dividend to 31 and continue with: 315 / 91

Let's proceed to step 4:
The number 91 fits into 315 3 times, leaving a remainder of 42.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
Subtracting 273 from 315 leaves us with 42.
Bring next digit (7) of the dividend behind the 42 and repeat the process: 427 / 91

Moving on to step 5:
If we divide 427 by 91, we get 4 and a remainder of 63.
The next digit of our result is 4. 
Result so far: 134.0
Deduct 364 from 427 and we're left with 63.
Bring next digit (9) of the dividend behind the 63 and repeat the process: 639 / 91

Moving on to step 6:
91 can be fit into 639 7 times, resulting in a remainder of 2.
Write down 7 as next digit of the result. 
Result so far: 1347.0
If we take 637 away from 639, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
20 divided by 91 is 0 with a remainder of 20.
The number 0 becomes the next digit in our result. 
Result so far: 1347.0
If we take 0 away from 20, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
The number 91 fits into 200 2 times, leaving a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 1347.02
If we take 182 away from 200, we end up with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 9:
91 goes into 180 1 times with a remainder of 89.
Write down 1 as next digit of the result. 
Result so far: 1347.021
If we subtract 91 from 180, we get 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Moving on to step 10:
When dividing 890 by 91, we get 9 with a remainder of 71.
The next digit of our result is 9. 
Result so far: 1347.0219
Deduct 819 from 890 and we're left with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Step 11:
91 can be fit into 710 7 times, resulting in a remainder of 73.
The next digit of our result is 7. 
Result so far: 1347.02197
If we take 637 away from 710, we end up with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 12:
91 goes into 730 8 times with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 1347.021978
Subtracting 728 from 730 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 13:
91 can be fit into 20 0 times, resulting in a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 1347.021978
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 14:
When dividing 200 by 91, we get 2 with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 1347.02197802
Subtract 182 from 200 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Our division results in 1347.02197802 with a remaining 1.8e-08.