We divide 743580 by 91
The aim is to understand the frequency of 91 in 743580.

Going ahead to step 1:
If we divide 7 by 91, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Take the next digit (4) from the dividend and append it to 7, then repeat: 74 / 91

Advancing to step 2:
The number 91 fits into 74 0 times, leaving a remainder of 74.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 74, we get 74.
Take the next digit (3) from the dividend and append it to 74, then repeat: 743 / 91

Going ahead to step 3:
743 divided by 91 is 8 with a remainder of 15.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtract 728 from 743 to get 15.
Include the next digit (5) from the dividend after 15, then repeat: 155 / 91

Let's proceed to step 4:
The number 91 fits into 155 1 times, leaving a remainder of 64.
The next digit of our result is 1. 
Result so far: 81.0
If we subtract 91 from 155, we get 64.
Fetch the next digit (8) from the dividend, attach it to 64 and continue: 648 / 91

Moving on to step 5:
91 can be fit into 648 7 times, resulting in a remainder of 11.
Record the quotient 7 as the next digit in the result. 
Result so far: 817.0
The remainder is 11 after subtracting 637 from 648.
Grab the next digit (0) from the dividend, add it to 11, then carry on: 110 / 91

Step 6:
91 goes into 110 1 times with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 8171.0
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.

Let's proceed to step 7:
91 goes into 190 2 times with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 8171.2
The remainder is 8 after subtracting 182 from 190.
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 8:
If we divide 80 by 91, we get 0 and a remainder of 80.
Write down 0 as next digit of the result. 
Result so far: 8171.2
If we subtract 0 from 80, we 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 9:
91 can be fit into 800 8 times, resulting in a remainder of 72.
The next digit of our result is 8. 
Result so far: 8171.208
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.

Let's proceed to step 10:
When dividing 720 by 91, we get 7 with a remainder of 83.
Write down 7 as next digit of the result. 
Result so far: 8171.2087
Subtracting 637 from 720 leaves us with 83.
Since there are no more digits in the dividend, we add a zero to the remainder making it 830, and continue the process.

Advancing to step 11:
830 divided by 91 is 9 with a remainder of 11.
The next digit of our result is 9. 
Result so far: 8171.20879
Subtract 819 from 830 to get 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 12:
If we divide 110 by 91, we get 1 and a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 8171.208791
Deduct 91 from 110 and we're left 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.

Step 13:
The number 91 fits into 190 2 times, leaving a remainder of 8.
The next digit of our result is 2. 
Result so far: 8171.2087912
The remainder is 8 after subtracting 182 from 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 14:
If we divide 80 by 91, we get 0 and a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 8171.2087912
If we take 0 away from 80, we end up 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.

The final outcome is 8171.2087912, with a leftover of 8e-08.