Let's divide 328408 by 91
The aim is to understand the frequency of 91 in 328408.

Advancing to step 1:
91 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (2) from the dividend, add it to 3, then carry on: 32 / 91

Advancing to step 2:
91 can be fit into 32 0 times, resulting in a remainder of 32.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 32 to get 32.
Fetch the next digit (8) from the dividend, attach it to 32 and continue: 328 / 91

Step 3:
If we divide 328 by 91, we get 3 and a remainder of 55.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 273 away from 328, we end up with 55.
Take the next digit (4) from the dividend and append it to 55, then repeat: 554 / 91

On to step 4:
The number 91 fits into 554 6 times, leaving a remainder of 8.
The next digit of our result is 6. 
Result so far: 36.0
Deduct 546 from 554 and we're left with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 91

Going ahead to step 5:
When dividing 80 by 91, we get 0 with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 360.0
Deduct 0 from 80 and we're left with 80.
Take the next digit (8) from the dividend and append it to 80, then repeat: 808 / 91

Advancing to step 6:
808 divided by 91 is 8 with a remainder of 80.
Record the quotient 8 as the next digit in the result. 
Result so far: 3608.0
Subtract 728 from 808 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Advancing to step 7:
The number 91 fits into 800 8 times, leaving a remainder of 72.
Use 8 as the next digit of our solution. 
Result so far: 3608.8
If we take 728 away from 800, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Moving on to step 8:
720 divided by 91 is 7 with a remainder of 83.
Write down 7 as next digit of the result. 
Result so far: 3608.87
If we subtract 637 from 720, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Moving on to step 9:
830 divided by 91 is 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 3608.879
If we take 819 away from 830, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Advancing to step 10:
If we divide 110 by 91, we get 1 and a remainder of 19.
The next digit of our result is 1. 
Result so far: 3608.8791
If we take 91 away from 110, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 11:
91 goes into 190 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 3608.87912
If we subtract 182 from 190, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 12:
When dividing 80 by 91, we get 0 with a remainder of 80.
Record the quotient 0 as the next digit in the result. 
Result so far: 3608.87912
Deduct 0 from 80 and we're left with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 13:
91 goes into 800 8 times with a remainder of 72.
The number 8 becomes the next digit in our result. 
Result so far: 3608.8791208
If we take 728 away from 800, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 14:
91 can be fit into 720 7 times, resulting in a remainder of 83.
The number 7 becomes the next digit in our result. 
Result so far: 3608.87912087
If we subtract 637 from 720, we get 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

The final result is 3608.87912087 with a remainder of 8.3e-08.