743903 ÷ 91 
The aim is to understand the frequency of 91 in 743903.

Moving on to step 1:
91 goes into 7 0 times with a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Fetch the next digit (4) from the dividend, attach it to 7 and continue: 74 / 91

Step 2:
91 goes into 74 0 times with a remainder of 74.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 74 after subtracting 0 from 74.
Fetch the next digit (3) from the dividend, attach it to 74 and continue: 743 / 91

Advancing to step 3:
The number 91 fits into 743 8 times, leaving a remainder of 15.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we take 728 away from 743, we end up with 15.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 91

On to step 4:
159 divided by 91 is 1 with a remainder of 68.
The next digit of our result is 1. 
Result so far: 81.0
Deduct 91 from 159 and we're left with 68.
Grab the next digit (0) from the dividend, add it to 68, then carry on: 680 / 91

Advancing to step 5:
680 divided by 91 is 7 with a remainder of 43.
Put 7 as the next digit of the answer. 
Result so far: 817.0
Subtracting 637 from 680 leaves us with 43.
Append the next digit (3) from the dividend to 43 and continue with: 433 / 91

Going ahead to step 6:
91 can be fit into 433 4 times, resulting in a remainder of 69.
Write down 4 as next digit of the result. 
Result so far: 8174.0
Subtract 364 from 433 to get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 7:
When dividing 690 by 91, we get 7 with a remainder of 53.
The number 7 becomes the next digit in our result. 
Result so far: 8174.7
The remainder is 53 after subtracting 637 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 8:
91 can be fit into 530 5 times, resulting in a remainder of 75.
Write down 5 as next digit of the result. 
Result so far: 8174.75
Subtracting 455 from 530 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Going ahead to step 9:
If we divide 750 by 91, we get 8 and a remainder of 22.
The number 8 becomes the next digit in our result. 
Result so far: 8174.758
The remainder is 22 after subtracting 728 from 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 10:
When dividing 220 by 91, we get 2 with a remainder of 38.
Record the quotient 2 as the next digit in the result. 
Result so far: 8174.7582
If we subtract 182 from 220, we get 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Moving on to step 11:
The number 91 fits into 380 4 times, leaving a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 8174.75824
Deduct 364 from 380 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 12:
If we divide 160 by 91, we get 1 and a remainder of 69.
Put 1 as the next digit of the answer. 
Result so far: 8174.758241
The remainder is 69 after subtracting 91 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

On to step 13:
The number 91 fits into 690 7 times, leaving a remainder of 53.
Write down 7 as next digit of the result. 
Result so far: 8174.7582417
Subtract 637 from 690 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 14:
530 divided by 91 is 5 with a remainder of 75.
Use 5 as the next digit of our solution. 
Result so far: 8174.75824175
The remainder is 75 after subtracting 455 from 530.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

The final result is 8174.75824175 with a remainder of 7.5e-08.