We're dividing 39191 by 91 
The aim is to understand the frequency of 91 in 39191.

On to step 1:
When dividing 3 by 91, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 91

Step 2:
If we divide 39 by 91, we get 0 and a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Bring next digit (1) of the dividend behind the 39 and repeat the process: 391 / 91

Going ahead to step 3:
If we divide 391 by 91, we get 4 and a remainder of 27.
The next digit of our result is 4. 
Result so far: 4.0
The remainder is 27 after subtracting 364 from 391.
Fetch the next digit (9) from the dividend, attach it to 27 and continue: 279 / 91

On to step 4:
279 divided by 91 is 3 with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 43.0
If we subtract 273 from 279, we get 6.
Include the next digit (1) from the dividend after 6, then repeat: 61 / 91

Step 5:
91 goes into 61 0 times with a remainder of 61.
Use 0 as the next digit of our solution. 
Result so far: 430.0
Subtracting 0 from 61 leaves us with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

On to step 6:
The number 91 fits into 610 6 times, leaving a remainder of 64.
Record the quotient 6 as the next digit in the result. 
Result so far: 430.6
The remainder is 64 after subtracting 546 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 7:
If we divide 640 by 91, we get 7 and a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 430.67
The remainder is 3 after subtracting 637 from 640.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 8:
91 can be fit into 30 0 times, resulting in a remainder of 30.
The number 0 becomes the next digit in our result. 
Result so far: 430.67
Subtract 0 from 30 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Advancing to step 9:
When dividing 300 by 91, we get 3 with a remainder of 27.
Use 3 as the next digit of our solution. 
Result so far: 430.6703
The remainder is 27 after subtracting 273 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 10:
If we divide 270 by 91, we get 2 and a remainder of 88.
Record the quotient 2 as the next digit in the result. 
Result so far: 430.67032
If we subtract 182 from 270, we get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Moving on to step 11:
When dividing 880 by 91, we get 9 with a remainder of 61.
The next digit of our result is 9. 
Result so far: 430.670329
Subtract 819 from 880 to get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Moving on to step 12:
The number 91 fits into 610 6 times, leaving a remainder of 64.
The next digit of our result is 6. 
Result so far: 430.6703296
The remainder is 64 after subtracting 546 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Moving on to step 13:
The number 91 fits into 640 7 times, leaving a remainder of 3.
The next digit of our result is 7. 
Result so far: 430.67032967
Subtract 637 from 640 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Our division results in 430.67032967 with a remaining 3e-09.