We look at the division of 105879 by 91 
The aim is to understand the frequency of 91 in 105879.

Let's proceed to step 1:
91 goes into 1 0 times with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (0) from the dividend to 1 and continue with: 10 / 91

On to step 2:
If we divide 10 by 91, we get 0 and a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 10 to get 10.
Grab the next digit (5) from the dividend, add it to 10, then carry on: 105 / 91

Going ahead to step 3:
105 divided by 91 is 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtracting 91 from 105 leaves us with 14.
Fetch the next digit (8) from the dividend, attach it to 14 and continue: 148 / 91

Advancing to step 4:
If we divide 148 by 91, we get 1 and a remainder of 57.
The next digit of our result is 1. 
Result so far: 11.0
Deduct 91 from 148 and we're left with 57.
Bring next digit (7) of the dividend behind the 57 and repeat the process: 577 / 91

Advancing to step 5:
91 can be fit into 577 6 times, resulting in a remainder of 31.
Write down 6 as next digit of the result. 
Result so far: 116.0
Subtracting 546 from 577 leaves us with 31.
Take the next digit (9) from the dividend and append it to 31, then repeat: 319 / 91

Moving on to step 6:
91 can be fit into 319 3 times, resulting in a remainder of 46.
Write down 3 as next digit of the result. 
Result so far: 1163.0
The remainder is 46 after subtracting 273 from 319.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Let's proceed to step 7:
If we divide 460 by 91, we get 5 and a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 1163.5
Deduct 455 from 460 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 8:
91 can be fit into 50 0 times, resulting in a remainder of 50.
The next digit of our result is 0. 
Result so far: 1163.5
The remainder is 50 after subtracting 0 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 9:
The number 91 fits into 500 5 times, leaving a remainder of 45.
The number 5 becomes the next digit in our result. 
Result so far: 1163.505
If we take 455 away from 500, we end up with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 10:
When dividing 450 by 91, we get 4 with a remainder of 86.
Put 4 as the next digit of the answer. 
Result so far: 1163.5054
If we subtract 364 from 450, we get 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Advancing to step 11:
91 can be fit into 860 9 times, resulting in a remainder of 41.
Put 9 as the next digit of the answer. 
Result so far: 1163.50549
If we take 819 away from 860, we end up with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Going ahead to step 12:
91 goes into 410 4 times with a remainder of 46.
The number 4 becomes the next digit in our result. 
Result so far: 1163.505494
The remainder is 46 after subtracting 364 from 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

On to step 13:
91 can be fit into 460 5 times, resulting in a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 1163.5054945
If we take 455 away from 460, we end up with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 14:
If we divide 50 by 91, we get 0 and a remainder of 50.
The number 0 becomes the next digit in our result. 
Result so far: 1163.5054945
Subtracting 0 from 50 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

After the division, we end up with 1163.5054945 and a remainder of 5e-08.