628729 divided by 91 
The aim is to understand the frequency of 91 in 628729.

Step 1:
If we divide 6 by 91, we get 0 and a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 91

Advancing to step 2:
62 divided by 91 is 0 with a remainder of 62.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 62 leaves us with 62.
Take the next digit (8) from the dividend and append it to 62, then repeat: 628 / 91

Advancing to step 3:
91 can be fit into 628 6 times, resulting in a remainder of 82.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtracting 546 from 628 leaves us with 82.
Bring next digit (7) of the dividend behind the 82 and repeat the process: 827 / 91

Going ahead to step 4:
The number 91 fits into 827 9 times, leaving a remainder of 8.
The number 9 becomes the next digit in our result. 
Result so far: 69.0
If we take 819 away from 827, we end up with 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 91

Let's proceed to step 5:
82 divided by 91 is 0 with a remainder of 82.
Record the quotient 0 as the next digit in the result. 
Result so far: 690.0
The remainder is 82 after subtracting 0 from 82.
Fetch the next digit (9) from the dividend, attach it to 82 and continue: 829 / 91

Moving on to step 6:
829 divided by 91 is 9 with a remainder of 10.
Write down 9 as next digit of the result. 
Result so far: 6909.0
Subtracting 819 from 829 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 7:
When dividing 100 by 91, we get 1 with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 6909.1
The remainder is 9 after subtracting 91 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 8:
The number 91 fits into 90 0 times, leaving a remainder of 90.
The number 0 becomes the next digit in our result. 
Result so far: 6909.1
If we subtract 0 from 90, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

On to step 9:
When dividing 900 by 91, we get 9 with a remainder of 81.
Write down 9 as next digit of the result. 
Result so far: 6909.109
Subtracting 819 from 900 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

On to step 10:
91 can be fit into 810 8 times, resulting in a remainder of 82.
Record the quotient 8 as the next digit in the result. 
Result so far: 6909.1098
Subtracting 728 from 810 leaves us with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Let's proceed to step 11:
820 divided by 91 is 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 6909.10989
Subtracting 819 from 820 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 12:
If we divide 10 by 91, we get 0 and a remainder of 10.
The next digit of our result is 0. 
Result so far: 6909.10989
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 13:
The number 91 fits into 100 1 times, leaving a remainder of 9.
The next digit of our result is 1. 
Result so far: 6909.1098901
The remainder is 9 after subtracting 91 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 14:
When dividing 90 by 91, we get 0 with a remainder of 90.
Use 0 as the next digit of our solution. 
Result so far: 6909.1098901
Deduct 0 from 90 and we're left with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

The final result is 6909.1098901 with a remainder of 9e-08.