Let's divide 809039 by 91
The aim is to understand the frequency of 91 in 809039.

Step 1:
91 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 91

Moving on to step 2:
91 can be fit into 80 0 times, resulting in a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 80 after subtracting 0 from 80.
Fetch the next digit (9) from the dividend, attach it to 80 and continue: 809 / 91

Moving on to step 3:
If we divide 809 by 91, we get 8 and a remainder of 81.
The next digit of our result is 8. 
Result so far: 8.0
Deduct 728 from 809 and we're left with 81.
Fetch the next digit (0) from the dividend, attach it to 81 and continue: 810 / 91

Moving on to step 4:
If we divide 810 by 91, we get 8 and a remainder of 82.
The next digit of our result is 8. 
Result so far: 88.0
The remainder is 82 after subtracting 728 from 810.
Append the next digit (3) from the dividend to 82 and continue with: 823 / 91

On to step 5:
When dividing 823 by 91, we get 9 with a remainder of 4.
The number 9 becomes the next digit in our result. 
Result so far: 889.0
Subtracting 819 from 823 leaves us with 4.
Include the next digit (9) from the dividend after 4, then repeat: 49 / 91

Moving on to step 6:
91 goes into 49 0 times with a remainder of 49.
Put 0 as the next digit of the answer. 
Result so far: 8890.0
Subtracting 0 from 49 leaves us with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 7:
When dividing 490 by 91, we get 5 with a remainder of 35.
The next digit of our result is 5. 
Result so far: 8890.5
Subtract 455 from 490 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 8:
350 divided by 91 is 3 with a remainder of 77.
Use 3 as the next digit of our solution. 
Result so far: 8890.53
If we take 273 away from 350, we end up with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Let's proceed to step 9:
770 divided by 91 is 8 with a remainder of 42.
Use 8 as the next digit of our solution. 
Result so far: 8890.538
Deduct 728 from 770 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 10:
If we divide 420 by 91, we get 4 and a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 8890.5384
If we take 364 away from 420, we end up with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 11:
91 can be fit into 560 6 times, resulting in a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 8890.53846
If we subtract 546 from 560, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 12:
When dividing 140 by 91, we get 1 with a remainder of 49.
Write down 1 as next digit of the result. 
Result so far: 8890.538461
The remainder is 49 after subtracting 91 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 13:
490 divided by 91 is 5 with a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 8890.5384615
If we subtract 455 from 490, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 14:
If we divide 350 by 91, we get 3 and a remainder of 77.
The next digit of our result is 3. 
Result so far: 8890.53846153
If we subtract 273 from 350, we get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

The quotient of the division is 8890.53846153, and the remainder is 7.7e-08.