We look at the division of 51633 by 91 
The aim is to understand the frequency of 91 in 51633.

Step 1:
91 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 91

Advancing to step 2:
When dividing 51 by 91, we get 0 with a remainder of 51.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 51, we end up with 51.
Fetch the next digit (6) from the dividend, attach it to 51 and continue: 516 / 91

Advancing to step 3:
The number 91 fits into 516 5 times, leaving a remainder of 61.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Subtracting 455 from 516 leaves us with 61.
Fetch the next digit (3) from the dividend, attach it to 61 and continue: 613 / 91

Going ahead to step 4:
613 divided by 91 is 6 with a remainder of 67.
Use 6 as the next digit of our solution. 
Result so far: 56.0
If we take 546 away from 613, we end up with 67.
Append the next digit (3) from the dividend to 67 and continue with: 673 / 91

Step 5:
When dividing 673 by 91, we get 7 with a remainder of 36.
The number 7 becomes the next digit in our result. 
Result so far: 567.0
Subtract 637 from 673 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 6:
If we divide 360 by 91, we get 3 and a remainder of 87.
Record the quotient 3 as the next digit in the result. 
Result so far: 567.3
If we take 273 away from 360, we end up with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Moving on to step 7:
91 can be fit into 870 9 times, resulting in a remainder of 51.
Use 9 as the next digit of our solution. 
Result so far: 567.39
If we take 819 away from 870, we end up with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Let's proceed to step 8:
If we divide 510 by 91, we get 5 and a remainder of 55.
Write down 5 as next digit of the result. 
Result so far: 567.395
If we subtract 455 from 510, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Moving on to step 9:
The number 91 fits into 550 6 times, leaving a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 567.3956
Subtract 546 from 550 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 10:
The number 91 fits into 40 0 times, leaving a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 567.3956
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 11:
91 goes into 400 4 times with a remainder of 36.
Use 4 as the next digit of our solution. 
Result so far: 567.395604
Deduct 364 from 400 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 12:
360 divided by 91 is 3 with a remainder of 87.
The next digit of our result is 3. 
Result so far: 567.3956043
Subtract 273 from 360 to get 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Advancing to step 13:
The number 91 fits into 870 9 times, leaving a remainder of 51.
Write down 9 as next digit of the result. 
Result so far: 567.39560439
The remainder is 51 after subtracting 819 from 870.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

The final outcome is 567.39560439, with a leftover of 5.1e-08.