We look at the division of 524020 by 91 
The aim is to understand the frequency of 91 in 524020.

Moving on to step 1:
The number 91 fits into 5 0 times, leaving a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 91

On to step 2:
52 divided by 91 is 0 with a remainder of 52.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 52 to get 52.
Grab the next digit (4) from the dividend, add it to 52, then carry on: 524 / 91

Advancing to step 3:
If we divide 524 by 91, we get 5 and a remainder of 69.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Deduct 455 from 524 and we're left with 69.
Fetch the next digit (0) from the dividend, attach it to 69 and continue: 690 / 91

Advancing to step 4:
690 divided by 91 is 7 with a remainder of 53.
Record the quotient 7 as the next digit in the result. 
Result so far: 57.0
Subtracting 637 from 690 leaves us with 53.
Include the next digit (2) from the dividend after 53, then repeat: 532 / 91

On to step 5:
When dividing 532 by 91, we get 5 with a remainder of 77.
The next digit of our result is 5. 
Result so far: 575.0
If we take 455 away from 532, we end up with 77.
Fetch the next digit (0) from the dividend, attach it to 77 and continue: 770 / 91

Step 6:
The number 91 fits into 770 8 times, leaving a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 5758.0
If we subtract 728 from 770, we get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 7:
The number 91 fits into 420 4 times, leaving a remainder of 56.
Record the quotient 4 as the next digit in the result. 
Result so far: 5758.4
The remainder is 56 after subtracting 364 from 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Moving on to step 8:
560 divided by 91 is 6 with a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 5758.46
Deduct 546 from 560 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 9:
If we divide 140 by 91, we get 1 and a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 5758.461
If we subtract 91 from 140, we get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Going ahead to step 10:
91 can be fit into 490 5 times, resulting in a remainder of 35.
Record the quotient 5 as the next digit in the result. 
Result so far: 5758.4615
Subtract 455 from 490 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 11:
350 divided by 91 is 3 with a remainder of 77.
Record the quotient 3 as the next digit in the result. 
Result so far: 5758.46153
Subtract 273 from 350 to get 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Step 12:
91 goes into 770 8 times with a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 5758.461538
If we take 728 away from 770, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 13:
The number 91 fits into 420 4 times, leaving a remainder of 56.
The next digit of our result is 4. 
Result so far: 5758.4615384
Subtract 364 from 420 to get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 14:
91 goes into 560 6 times with a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 5758.46153846
Deduct 546 from 560 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 5758.46153846, with a leftover of 1.4e-08.