Let's divide 817550 by 91
The aim is to understand the frequency of 91 in 817550.

Going ahead to step 1:
If we divide 8 by 91, we get 0 and a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 91

On to step 2:
When dividing 81 by 91, we get 0 with a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 81, we end up with 81.
Bring next digit (7) of the dividend behind the 81 and repeat the process: 817 / 91

Moving on to step 3:
91 goes into 817 8 times with a remainder of 89.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtracting 728 from 817 leaves us with 89.
Grab the next digit (5) from the dividend, add it to 89, then carry on: 895 / 91

Step 4:
91 can be fit into 895 9 times, resulting in a remainder of 76.
Use 9 as the next digit of our solution. 
Result so far: 89.0
Subtract 819 from 895 to get 76.
Include the next digit (5) from the dividend after 76, then repeat: 765 / 91

Going ahead to step 5:
The number 91 fits into 765 8 times, leaving a remainder of 37.
Record the quotient 8 as the next digit in the result. 
Result so far: 898.0
Deduct 728 from 765 and we're left with 37.
Take the next digit (0) from the dividend and append it to 37, then repeat: 370 / 91

Moving on to step 6:
When dividing 370 by 91, we get 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 8984.0
Subtract 364 from 370 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 7:
The number 91 fits into 60 0 times, leaving a remainder of 60.
The number 0 becomes the next digit in our result. 
Result so far: 8984.0
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 8:
When dividing 600 by 91, we get 6 with a remainder of 54.
Write down 6 as next digit of the result. 
Result so far: 8984.06
If we take 546 away from 600, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 9:
The number 91 fits into 540 5 times, leaving a remainder of 85.
Record the quotient 5 as the next digit in the result. 
Result so far: 8984.065
If we take 455 away from 540, we end up with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

On to step 10:
When dividing 850 by 91, we get 9 with a remainder of 31.
Use 9 as the next digit of our solution. 
Result so far: 8984.0659
Deduct 819 from 850 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 11:
The number 91 fits into 310 3 times, leaving a remainder of 37.
The number 3 becomes the next digit in our result. 
Result so far: 8984.06593
Deduct 273 from 310 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 12:
If we divide 370 by 91, we get 4 and a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 8984.065934
Subtract 364 from 370 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 13:
When dividing 60 by 91, we get 0 with a remainder of 60.
Put 0 as the next digit of the answer. 
Result so far: 8984.065934
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 14:
If we divide 600 by 91, we get 6 and a remainder of 54.
The next digit of our result is 6. 
Result so far: 8984.06593406
Subtracting 546 from 600 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

The final result is 8984.06593406 with a remainder of 5.4e-08.