We look at the division of 488028 by 91 
The aim is to understand the frequency of 91 in 488028.

On to step 1:
91 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Include the next digit (8) from the dividend after 4, then repeat: 48 / 91

Going ahead to step 2:
48 divided by 91 is 0 with a remainder of 48.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 48, we end up with 48.
Grab the next digit (8) from the dividend, add it to 48, then carry on: 488 / 91

Moving on to step 3:
91 goes into 488 5 times with a remainder of 33.
Write down 5 as next digit of the result. 
Result so far: 5.0
Subtracting 455 from 488 leaves us with 33.
Include the next digit (0) from the dividend after 33, then repeat: 330 / 91

Going ahead to step 4:
91 goes into 330 3 times with a remainder of 57.
The number 3 becomes the next digit in our result. 
Result so far: 53.0
If we subtract 273 from 330, we get 57.
Fetch the next digit (2) from the dividend, attach it to 57 and continue: 572 / 91

Step 5:
572 divided by 91 is 6 with a remainder of 26.
Put 6 as the next digit of the answer. 
Result so far: 536.0
Subtracting 546 from 572 leaves us with 26.
Append the next digit (8) from the dividend to 26 and continue with: 268 / 91

On to step 6:
268 divided by 91 is 2 with a remainder of 86.
Put 2 as the next digit of the answer. 
Result so far: 5362.0
If we take 182 away from 268, we end up with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Moving on to step 7:
If we divide 860 by 91, we get 9 and a remainder of 41.
Write down 9 as next digit of the result. 
Result so far: 5362.9
If we subtract 819 from 860, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Moving on to step 8:
The number 91 fits into 410 4 times, leaving a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 5362.94
If we take 364 away from 410, we end up with 46.
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 9:
When dividing 460 by 91, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 5362.945
The remainder is 5 after subtracting 455 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 10:
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: 5362.945
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.

Step 11:
When dividing 500 by 91, we get 5 with a remainder of 45.
Use 5 as the next digit of our solution. 
Result so far: 5362.94505
Subtracting 455 from 500 leaves us 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 12:
The number 91 fits into 450 4 times, leaving a remainder of 86.
The next digit of our result is 4. 
Result so far: 5362.945054
If we take 364 away from 450, we end up with 86.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Moving on to step 13:
91 can be fit into 860 9 times, resulting in a remainder of 41.
Use 9 as the next digit of our solution. 
Result so far: 5362.9450549
Deduct 819 from 860 and we're left 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.

Advancing to step 14:
91 goes into 410 4 times with a remainder of 46.
The number 4 becomes the next digit in our result. 
Result so far: 5362.94505494
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.

After the division, we end up with 5362.94505494 and a remainder of 4.6e-08.