Let's divide 723645 by 91
The aim is to understand the frequency of 91 in 723645.

Let's proceed to step 1:
If we divide 7 by 91, we get 0 and a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Include the next digit (2) from the dividend after 7, then repeat: 72 / 91

Advancing to step 2:
If we divide 72 by 91, we get 0 and a remainder of 72.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 72, we get 72.
Take the next digit (3) from the dividend and append it to 72, then repeat: 723 / 91

Advancing to step 3:
91 can be fit into 723 7 times, resulting in a remainder of 86.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we take 637 away from 723, we end up with 86.
Grab the next digit (6) from the dividend, add it to 86, then carry on: 866 / 91

Step 4:
866 divided by 91 is 9 with a remainder of 47.
Use 9 as the next digit of our solution. 
Result so far: 79.0
Subtracting 819 from 866 leaves us with 47.
Append the next digit (4) from the dividend to 47 and continue with: 474 / 91

Advancing to step 5:
The number 91 fits into 474 5 times, leaving a remainder of 19.
The next digit of our result is 5. 
Result so far: 795.0
The remainder is 19 after subtracting 455 from 474.
Include the next digit (5) from the dividend after 19, then repeat: 195 / 91

Step 6:
The number 91 fits into 195 2 times, leaving a remainder of 13.
Record the quotient 2 as the next digit in the result. 
Result so far: 7952.0
If we take 182 away from 195, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
The number 91 fits into 130 1 times, leaving a remainder of 39.
Use 1 as the next digit of our solution. 
Result so far: 7952.1
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.

Going ahead to step 8:
91 goes into 390 4 times with a remainder of 26.
The number 4 becomes the next digit in our result. 
Result so far: 7952.14
The remainder is 26 after subtracting 364 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Advancing to step 9:
The number 91 fits into 260 2 times, leaving a remainder of 78.
The next digit of our result is 2. 
Result so far: 7952.142
Deduct 182 from 260 and we're left with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Moving on to step 10:
The number 91 fits into 780 8 times, leaving a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 7952.1428
Subtracting 728 from 780 leaves us 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.

Advancing to step 11:
If we divide 520 by 91, we get 5 and a remainder of 65.
Write down 5 as next digit of the result. 
Result so far: 7952.14285
The remainder is 65 after subtracting 455 from 520.
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 12:
650 divided by 91 is 7 with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 7952.142857
If we subtract 637 from 650, we 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.

Going ahead to step 13:
When dividing 130 by 91, we get 1 with a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 7952.1428571
Deduct 91 from 130 and we're left 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 14:
The number 91 fits into 390 4 times, leaving a remainder of 26.
Record the quotient 4 as the next digit in the result. 
Result so far: 7952.14285714
Subtracting 364 from 390 leaves us 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.

After the division, we end up with 7952.14285714 and a remainder of 2.6e-08.