We look at the division of 367518 by 91 
The aim is to understand the frequency of 91 in 367518.

On to step 1:
91 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 91

Advancing to step 2:
When dividing 36 by 91, we get 0 with a remainder of 36.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 36, we end up with 36.
Include the next digit (7) from the dividend after 36, then repeat: 367 / 91

Let's proceed to step 3:
The number 91 fits into 367 4 times, leaving a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtracting 364 from 367 leaves us with 3.
Take the next digit (5) from the dividend and append it to 3, then repeat: 35 / 91

On to step 4:
91 goes into 35 0 times with a remainder of 35.
The number 0 becomes the next digit in our result. 
Result so far: 40.0
Subtract 0 from 35 to get 35.
Include the next digit (1) from the dividend after 35, then repeat: 351 / 91

Let's proceed to step 5:
If we divide 351 by 91, we get 3 and a remainder of 78.
The next digit of our result is 3. 
Result so far: 403.0
Deduct 273 from 351 and we're left with 78.
Include the next digit (8) from the dividend after 78, then repeat: 788 / 91

Step 6:
When dividing 788 by 91, we get 8 with a remainder of 60.
Record the quotient 8 as the next digit in the result. 
Result so far: 4038.0
The remainder is 60 after subtracting 728 from 788.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 7:
When dividing 600 by 91, we get 6 with a remainder of 54.
The next digit of our result is 6. 
Result so far: 4038.6
Subtract 546 from 600 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Let's proceed to step 8:
91 goes into 540 5 times with a remainder of 85.
The next digit of our result is 5. 
Result so far: 4038.65
Subtract 455 from 540 to get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Advancing to step 9:
91 can be fit into 850 9 times, resulting in a remainder of 31.
Use 9 as the next digit of our solution. 
Result so far: 4038.659
Deduct 819 from 850 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

On to step 10:
The number 91 fits into 310 3 times, leaving a remainder of 37.
The number 3 becomes the next digit in our result. 
Result so far: 4038.6593
Subtracting 273 from 310 leaves us with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Advancing to step 11:
91 goes into 370 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 4038.65934
If we subtract 364 from 370, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 12:
When dividing 60 by 91, we get 0 with a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 4038.65934
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 13:
600 divided by 91 is 6 with a remainder of 54.
Put 6 as the next digit of the answer. 
Result so far: 4038.6593406
If we take 546 away from 600, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 14:
The number 91 fits into 540 5 times, leaving a remainder of 85.
The number 5 becomes the next digit in our result. 
Result so far: 4038.65934065
If we subtract 455 from 540, we get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Our division results in 4038.65934065 with a remaining 8.5e-08.