232921 divided by 91 
The aim is to understand the frequency of 91 in 232921.

Going ahead to step 1:
The number 91 fits into 2 0 times, leaving a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 91

Going ahead to step 2:
If we divide 23 by 91, we get 0 and a remainder of 23.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 23 and we're left with 23.
Append the next digit (2) from the dividend to 23 and continue with: 232 / 91

On to step 3:
The number 91 fits into 232 2 times, leaving a remainder of 50.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 182 from 232 and we're left with 50.
Grab the next digit (9) from the dividend, add it to 50, then carry on: 509 / 91

Advancing to step 4:
When dividing 509 by 91, we get 5 with a remainder of 54.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
Subtract 455 from 509 to get 54.
Include the next digit (2) from the dividend after 54, then repeat: 542 / 91

Moving on to step 5:
When dividing 542 by 91, we get 5 with a remainder of 87.
Write down 5 as next digit of the result. 
Result so far: 255.0
If we subtract 455 from 542, we get 87.
Append the next digit (1) from the dividend to 87 and continue with: 871 / 91

Step 6:
If we divide 871 by 91, we get 9 and a remainder of 52.
Record the quotient 9 as the next digit in the result. 
Result so far: 2559.0
Deduct 819 from 871 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 7:
If we divide 520 by 91, we get 5 and a remainder of 65.
Put 5 as the next digit of the answer. 
Result so far: 2559.5
If we subtract 455 from 520, we get 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 8:
91 goes into 650 7 times with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 2559.57
The remainder is 13 after subtracting 637 from 650.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 9:
91 can be fit into 130 1 times, resulting in a remainder of 39.
Record the quotient 1 as the next digit in the result. 
Result so far: 2559.571
Subtracting 91 from 130 leaves us with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Let's proceed to step 10:
If we divide 390 by 91, we get 4 and a remainder of 26.
Write down 4 as next digit of the result. 
Result so far: 2559.5714
Deduct 364 from 390 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 11:
260 divided by 91 is 2 with a remainder of 78.
Put 2 as the next digit of the answer. 
Result so far: 2559.57142
If we subtract 182 from 260, we get 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Step 12:
780 divided by 91 is 8 with a remainder of 52.
The next digit of our result is 8. 
Result so far: 2559.571428
Deduct 728 from 780 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Going ahead to step 13:
The number 91 fits into 520 5 times, leaving a remainder of 65.
The next digit of our result is 5. 
Result so far: 2559.5714285
Subtracting 455 from 520 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Let's proceed to step 14:
The number 91 fits into 650 7 times, leaving a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 2559.57142857
Subtract 637 from 650 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

After the division, we end up with 2559.57142857 and a remainder of 1.3e-08.