90524 ÷ 91 
The aim is to understand the frequency of 91 in 90524.

Let's proceed to step 1:
If we divide 9 by 91, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Grab the next digit (0) from the dividend, add it to 9, then carry on: 90 / 91

On to step 2:
91 can be fit into 90 0 times, resulting in a remainder of 90.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 90, we get 90.
Fetch the next digit (5) from the dividend, attach it to 90 and continue: 905 / 91

Let's proceed to step 3:
If we divide 905 by 91, we get 9 and a remainder of 86.
The next digit of our result is 9. 
Result so far: 9.0
Subtracting 819 from 905 leaves us with 86.
Grab the next digit (2) from the dividend, add it to 86, then carry on: 862 / 91

On to step 4:
91 can be fit into 862 9 times, resulting in a remainder of 43.
Write down 9 as next digit of the result. 
Result so far: 99.0
The remainder is 43 after subtracting 819 from 862.
Include the next digit (4) from the dividend after 43, then repeat: 434 / 91

Step 5:
91 goes into 434 4 times with a remainder of 70.
The next digit of our result is 4. 
Result so far: 994.0
Deduct 364 from 434 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 6:
700 divided by 91 is 7 with a remainder of 63.
Write down 7 as next digit of the result. 
Result so far: 994.7
If we take 637 away from 700, we end up with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

On to step 7:
91 goes into 630 6 times with a remainder of 84.
Use 6 as the next digit of our solution. 
Result so far: 994.76
If we subtract 546 from 630, we get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Moving on to step 8:
When dividing 840 by 91, we get 9 with a remainder of 21.
Record the quotient 9 as the next digit in the result. 
Result so far: 994.769
If we take 819 away from 840, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 9:
If we divide 210 by 91, we get 2 and a remainder of 28.
Write down 2 as next digit of the result. 
Result so far: 994.7692
If we subtract 182 from 210, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 10:
The number 91 fits into 280 3 times, leaving a remainder of 7.
Write down 3 as next digit of the result. 
Result so far: 994.76923
Deduct 273 from 280 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 11:
91 can be fit into 70 0 times, resulting in a remainder of 70.
Record the quotient 0 as the next digit in the result. 
Result so far: 994.76923
If we subtract 0 from 70, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Moving on to step 12:
91 goes into 700 7 times with a remainder of 63.
The next digit of our result is 7. 
Result so far: 994.7692307
Subtracting 637 from 700 leaves us with 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Let's proceed to step 13:
When dividing 630 by 91, we get 6 with a remainder of 84.
The next digit of our result is 6. 
Result so far: 994.76923076
Subtracting 546 from 630 leaves us with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

The final outcome is 994.76923076, with a leftover of 8.4e-08.