We look at the division of 743706 by 91 
The aim is to understand the frequency of 91 in 743706.

On to step 1:
91 goes into 7 0 times with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Take the next digit (4) from the dividend and append it to 7, then repeat: 74 / 91

Step 2:
When dividing 74 by 91, we get 0 with a remainder of 74.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 74 after subtracting 0 from 74.
Bring next digit (3) of the dividend behind the 74 and repeat the process: 743 / 91

Step 3:
91 can be fit into 743 8 times, resulting in a remainder of 15.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 728 from 743 leaves us with 15.
Fetch the next digit (7) from the dividend, attach it to 15 and continue: 157 / 91

On to step 4:
157 divided by 91 is 1 with a remainder of 66.
Record the quotient 1 as the next digit in the result. 
Result so far: 81.0
Subtracting 91 from 157 leaves us with 66.
Take the next digit (0) from the dividend and append it to 66, then repeat: 660 / 91

Step 5:
91 goes into 660 7 times with a remainder of 23.
Write down 7 as next digit of the result. 
Result so far: 817.0
Subtracting 637 from 660 leaves us with 23.
Take the next digit (6) from the dividend and append it to 23, then repeat: 236 / 91

Let's proceed to step 6:
236 divided by 91 is 2 with a remainder of 54.
The number 2 becomes the next digit in our result. 
Result so far: 8172.0
If we subtract 182 from 236, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 7:
The number 91 fits into 540 5 times, leaving a remainder of 85.
The number 5 becomes the next digit in our result. 
Result so far: 8172.5
Deduct 455 from 540 and we're left with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Going ahead to step 8:
When dividing 850 by 91, we get 9 with a remainder of 31.
The next digit of our result is 9. 
Result so far: 8172.59
Subtract 819 from 850 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Let's proceed to step 9:
310 divided by 91 is 3 with a remainder of 37.
The number 3 becomes the next digit in our result. 
Result so far: 8172.593
Subtract 273 from 310 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 10:
91 can be fit into 370 4 times, resulting in a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 8172.5934
Deduct 364 from 370 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 11:
60 divided by 91 is 0 with a remainder of 60.
The next digit of our result is 0. 
Result so far: 8172.5934
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 12:
600 divided by 91 is 6 with a remainder of 54.
Write down 6 as next digit of the result. 
Result so far: 8172.593406
Subtract 546 from 600 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 13:
91 goes into 540 5 times with a remainder of 85.
Record the quotient 5 as the next digit in the result. 
Result so far: 8172.5934065
Subtracting 455 from 540 leaves us with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Advancing to step 14:
The number 91 fits into 850 9 times, leaving a remainder of 31.
Put 9 as the next digit of the answer. 
Result so far: 8172.59340659
Subtract 819 from 850 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

After the division, we end up with 8172.59340659 and a remainder of 3.1e-08.