We look at the division of 93393 by 91 
The aim is to understand the frequency of 91 in 93393.

Advancing to step 1:
The number 91 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Append the next digit (3) from the dividend to 9 and continue with: 93 / 91

Advancing to step 2:
The number 91 fits into 93 1 times, leaving a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 91 from 93 and we're left with 2.
Grab the next digit (3) from the dividend, add it to 2, then carry on: 23 / 91

Going ahead to step 3:
When dividing 23 by 91, we get 0 with a remainder of 23.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtracting 0 from 23 leaves us with 23.
Take the next digit (9) from the dividend and append it to 23, then repeat: 239 / 91

Going ahead to step 4:
If we divide 239 by 91, we get 2 and a remainder of 57.
Record the quotient 2 as the next digit in the result. 
Result so far: 102.0
Subtracting 182 from 239 leaves us with 57.
Append the next digit (3) from the dividend to 57 and continue with: 573 / 91

On to step 5:
573 divided by 91 is 6 with a remainder of 27.
Put 6 as the next digit of the answer. 
Result so far: 1026.0
The remainder is 27 after subtracting 546 from 573.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 6:
270 divided by 91 is 2 with a remainder of 88.
Use 2 as the next digit of our solution. 
Result so far: 1026.2
If we take 182 away from 270, we end up with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Advancing to step 7:
880 divided by 91 is 9 with a remainder of 61.
Use 9 as the next digit of our solution. 
Result so far: 1026.29
If we take 819 away from 880, we end up with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

On to step 8:
If we divide 610 by 91, we get 6 and a remainder of 64.
Write down 6 as next digit of the result. 
Result so far: 1026.296
The remainder is 64 after subtracting 546 from 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

On to step 9:
The number 91 fits into 640 7 times, leaving a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 1026.2967
Deduct 637 from 640 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Let's proceed to step 10:
91 can be fit into 30 0 times, resulting in a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 1026.2967
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 11:
91 can be fit into 300 3 times, resulting in a remainder of 27.
The number 3 becomes the next digit in our result. 
Result so far: 1026.296703
If we take 273 away from 300, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

On to step 12:
270 divided by 91 is 2 with a remainder of 88.
Use 2 as the next digit of our solution. 
Result so far: 1026.2967032
Subtract 182 from 270 to get 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Let's proceed to step 13:
91 goes into 880 9 times with a remainder of 61.
Use 9 as the next digit of our solution. 
Result so far: 1026.29670329
Subtracting 819 from 880 leaves us with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

The final outcome is 1026.29670329, with a leftover of 6.1e-08.