57968 ÷ 91 
The aim is to understand the frequency of 91 in 57968.

Moving on 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
If we subtract 0 from 5, we get 5.
Grab the next digit (7) from the dividend, add it to 5, then carry on: 57 / 91

On to step 2:
57 divided by 91 is 0 with a remainder of 57.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 57 leaves us with 57.
Grab the next digit (9) from the dividend, add it to 57, then carry on: 579 / 91

Moving on to step 3:
91 can be fit into 579 6 times, resulting in a remainder of 33.
The next digit of our result is 6. 
Result so far: 6.0
The remainder is 33 after subtracting 546 from 579.
Grab the next digit (6) from the dividend, add it to 33, then carry on: 336 / 91

Advancing to step 4:
When dividing 336 by 91, we get 3 with a remainder of 63.
Record the quotient 3 as the next digit in the result. 
Result so far: 63.0
If we take 273 away from 336, we end up with 63.
Bring next digit (8) of the dividend behind the 63 and repeat the process: 638 / 91

Going ahead to step 5:
If we divide 638 by 91, we get 7 and a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 637.0
Subtract 637 from 638 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 6:
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: 637.0
Subtracting 0 from 10 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.

Let's proceed to step 7:
If we divide 100 by 91, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 637.01
Deduct 91 from 100 and we're left with 9.
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.
Put 0 as the next digit of the answer. 
Result so far: 637.01
The remainder is 90 after subtracting 0 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 9:
When dividing 900 by 91, we get 9 with a remainder of 81.
The next digit of our result is 9. 
Result so far: 637.0109
If we subtract 819 from 900, we get 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Advancing to step 10:
When dividing 810 by 91, we get 8 with a remainder of 82.
Record the quotient 8 as the next digit in the result. 
Result so far: 637.01098
The remainder is 82 after subtracting 728 from 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Going ahead to step 11:
The number 91 fits into 820 9 times, leaving a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 637.010989
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.

Step 12:
10 divided by 91 is 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 637.010989
If we subtract 0 from 10, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 13:
100 divided by 91 is 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 637.01098901
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.

The final outcome is 637.01098901, with a leftover of 9e-09.