We're dividing 823440 by 91 
The aim is to understand the frequency of 91 in 823440.

Going ahead to step 1:
When dividing 8 by 91, we get 0 with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 91

Advancing to step 2:
91 goes into 82 0 times with a remainder of 82.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 82, we get 82.
Fetch the next digit (3) from the dividend, attach it to 82 and continue: 823 / 91

On to step 3:
91 goes into 823 9 times with a remainder of 4.
The next digit of our result is 9. 
Result so far: 9.0
If we take 819 away from 823, we end up with 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 91

Going ahead to step 4:
91 goes into 44 0 times with a remainder of 44.
Put 0 as the next digit of the answer. 
Result so far: 90.0
If we subtract 0 from 44, we get 44.
Take the next digit (4) from the dividend and append it to 44, then repeat: 444 / 91

Advancing to step 5:
91 can be fit into 444 4 times, resulting in a remainder of 80.
Write down 4 as next digit of the result. 
Result so far: 904.0
Subtract 364 from 444 to get 80.
Append the next digit (0) from the dividend to 80 and continue with: 800 / 91

Let's proceed to step 6:
The number 91 fits into 800 8 times, leaving a remainder of 72.
The next digit of our result is 8. 
Result so far: 9048.0
If we subtract 728 from 800, we get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 7:
If we divide 720 by 91, we get 7 and a remainder of 83.
The next digit of our result is 7. 
Result so far: 9048.7
The remainder is 83 after subtracting 637 from 720.
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 8:
91 can be fit into 830 9 times, resulting in a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 9048.79
Deduct 819 from 830 and we're left 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 9:
If we divide 110 by 91, we get 1 and a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 9048.791
Subtracting 91 from 110 leaves us 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 10:
The number 91 fits into 190 2 times, leaving a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 9048.7912
If we take 182 away from 190, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 11:
When dividing 80 by 91, we get 0 with a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 9048.7912
Subtract 0 from 80 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.

Going ahead to step 12:
800 divided by 91 is 8 with a remainder of 72.
Write down 8 as next digit of the result. 
Result so far: 9048.791208
Subtract 728 from 800 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 13:
720 divided by 91 is 7 with a remainder of 83.
Put 7 as the next digit of the answer. 
Result so far: 9048.7912087
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.

On to step 14:
The number 91 fits into 830 9 times, leaving a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 9048.79120879
The remainder is 11 after subtracting 819 from 830.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

The final result is 9048.79120879 with a remainder of 1.1e-08.