Let's divide 783243 by 91
The aim is to understand the frequency of 91 in 783243.

Going ahead to step 1:
When dividing 7 by 91, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 91

Moving on to step 2:
78 divided by 91 is 0 with a remainder of 78.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Grab the next digit (3) from the dividend, add it to 78, then carry on: 783 / 91

Step 3:
If we divide 783 by 91, we get 8 and a remainder of 55.
The next digit of our result is 8. 
Result so far: 8.0
Subtracting 728 from 783 leaves us with 55.
Grab the next digit (2) from the dividend, add it to 55, then carry on: 552 / 91

On to step 4:
When dividing 552 by 91, we get 6 with a remainder of 6.
The number 6 becomes the next digit in our result. 
Result so far: 86.0
Subtract 546 from 552 to get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 91

Step 5:
64 divided by 91 is 0 with a remainder of 64.
The next digit of our result is 0. 
Result so far: 860.0
Deduct 0 from 64 and we're left with 64.
Bring next digit (3) of the dividend behind the 64 and repeat the process: 643 / 91

Moving on to step 6:
If we divide 643 by 91, we get 7 and a remainder of 6.
Use 7 as the next digit of our solution. 
Result so far: 8607.0
The remainder is 6 after subtracting 637 from 643.
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 7:
91 can be fit into 60 0 times, resulting in a remainder of 60.
Write down 0 as next digit of the result. 
Result so far: 8607.0
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.

Moving on to step 8:
If we divide 600 by 91, we get 6 and a remainder of 54.
Write down 6 as next digit of the result. 
Result so far: 8607.06
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.

Advancing to step 9:
91 can be fit into 540 5 times, resulting in a remainder of 85.
Put 5 as the next digit of the answer. 
Result so far: 8607.065
The remainder is 85 after subtracting 455 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Step 10:
The number 91 fits into 850 9 times, leaving a remainder of 31.
Record the quotient 9 as the next digit in the result. 
Result so far: 8607.0659
If we take 819 away from 850, we end up 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.

Going ahead to step 11:
If we divide 310 by 91, we get 3 and a remainder of 37.
Record the quotient 3 as the next digit in the result. 
Result so far: 8607.06593
If we take 273 away from 310, we end up 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.

Advancing to step 12:
If we divide 370 by 91, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 8607.065934
If we take 364 away from 370, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 13:
When dividing 60 by 91, we get 0 with a remainder of 60.
Use 0 as the next digit of our solution. 
Result so far: 8607.065934
If we take 0 away from 60, we end up 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.

Going ahead to step 14:
When dividing 600 by 91, we get 6 with a remainder of 54.
The number 6 becomes the next digit in our result. 
Result so far: 8607.06593406
Subtract 546 from 600 to get 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 8607.06593406 with a remainder of 5.4e-08.