We're dividing 386020 by 91 
The aim is to understand the frequency of 91 in 386020.

Step 1:
When dividing 3 by 91, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 91

Moving on to step 2:
If we divide 38 by 91, we get 0 and a remainder of 38.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 38 to get 38.
Bring next digit (6) of the dividend behind the 38 and repeat the process: 386 / 91

On to step 3:
91 can be fit into 386 4 times, resulting in a remainder of 22.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Deduct 364 from 386 and we're left with 22.
Fetch the next digit (0) from the dividend, attach it to 22 and continue: 220 / 91

Step 4:
If we divide 220 by 91, we get 2 and a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 42.0
If we subtract 182 from 220, we get 38.
Take the next digit (2) from the dividend and append it to 38, then repeat: 382 / 91

On to step 5:
The number 91 fits into 382 4 times, leaving a remainder of 18.
The next digit of our result is 4. 
Result so far: 424.0
Subtract 364 from 382 to get 18.
Fetch the next digit (0) from the dividend, attach it to 18 and continue: 180 / 91

Let's proceed to step 6:
The number 91 fits into 180 1 times, leaving a remainder of 89.
Put 1 as the next digit of the answer. 
Result so far: 4241.0
The remainder is 89 after subtracting 91 from 180.
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 7:
When dividing 890 by 91, we get 9 with a remainder of 71.
The number 9 becomes the next digit in our result. 
Result so far: 4241.9
The remainder is 71 after subtracting 819 from 890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Moving on to step 8:
The number 91 fits into 710 7 times, leaving a remainder of 73.
The next digit of our result is 7. 
Result so far: 4241.97
Subtracting 637 from 710 leaves us 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.

Going ahead to step 9:
91 goes into 730 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 4241.978
Deduct 728 from 730 and we're left 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.

Advancing to step 10:
20 divided by 91 is 0 with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 4241.978
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.

Step 11:
91 can be fit into 200 2 times, resulting in a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 4241.97802
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.

Advancing to step 12:
If we divide 180 by 91, we get 1 and a remainder of 89.
Write down 1 as next digit of the result. 
Result so far: 4241.978021
Subtract 91 from 180 to 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.

Going ahead to step 13:
91 can be fit into 890 9 times, resulting in a remainder of 71.
Record the quotient 9 as the next digit in the result. 
Result so far: 4241.9780219
If we subtract 819 from 890, we get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Advancing to step 14:
If we divide 710 by 91, we get 7 and a remainder of 73.
Write down 7 as next digit of the result. 
Result so far: 4241.97802197
If we subtract 637 from 710, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

The final result is 4241.97802197 with a remainder of 7.3e-08.