We look at the division of 526111 by 91 
The aim is to understand the frequency of 91 in 526111.

Going ahead to step 1:
When dividing 5 by 91, we get 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 91

Advancing to step 2:
91 goes into 52 0 times with a remainder of 52.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 52 after subtracting 0 from 52.
Grab the next digit (6) from the dividend, add it to 52, then carry on: 526 / 91

Moving on to step 3:
If we divide 526 by 91, we get 5 and a remainder of 71.
The number 5 becomes the next digit in our result. 
Result so far: 5.0
The remainder is 71 after subtracting 455 from 526.
Append the next digit (1) from the dividend to 71 and continue with: 711 / 91

On to step 4:
When dividing 711 by 91, we get 7 with a remainder of 74.
Write down 7 as next digit of the result. 
Result so far: 57.0
Subtracting 637 from 711 leaves us with 74.
Include the next digit (1) from the dividend after 74, then repeat: 741 / 91

On to step 5:
When dividing 741 by 91, we get 8 with a remainder of 13.
Put 8 as the next digit of the answer. 
Result so far: 578.0
Subtract 728 from 741 to get 13.
Bring next digit (1) of the dividend behind the 13 and repeat the process: 131 / 91

Let's proceed to step 6:
If we divide 131 by 91, we get 1 and a remainder of 40.
Record the quotient 1 as the next digit in the result. 
Result so far: 5781.0
The remainder is 40 after subtracting 91 from 131.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 7:
If we divide 400 by 91, we get 4 and a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 5781.4
If we take 364 away from 400, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 8:
The number 91 fits into 360 3 times, leaving a remainder of 87.
The next digit of our result is 3. 
Result so far: 5781.43
The remainder is 87 after subtracting 273 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 9:
870 divided by 91 is 9 with a remainder of 51.
Use 9 as the next digit of our solution. 
Result so far: 5781.439
If we subtract 819 from 870, we get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 10:
When dividing 510 by 91, we get 5 with a remainder of 55.
Use 5 as the next digit of our solution. 
Result so far: 5781.4395
Subtract 455 from 510 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 11:
91 can be fit into 550 6 times, resulting in a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 5781.43956
If we subtract 546 from 550, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 12:
40 divided by 91 is 0 with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 5781.43956
Subtract 0 from 40 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 13:
91 goes into 400 4 times with a remainder of 36.
The next digit of our result is 4. 
Result so far: 5781.4395604
If we take 364 away from 400, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 14:
360 divided by 91 is 3 with a remainder of 87.
The number 3 becomes the next digit in our result. 
Result so far: 5781.43956043
Subtracting 273 from 360 leaves us with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

The final result is 5781.43956043 with a remainder of 8.7e-08.