We look at the division of 463902 by 91 
The aim is to understand the frequency of 91 in 463902.

Advancing to step 1:
91 can be fit into 4 0 times, resulting in a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Grab the next digit (6) from the dividend, add it to 4, then carry on: 46 / 91

Advancing to step 2:
The number 91 fits into 46 0 times, leaving a remainder of 46.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 46, we end up with 46.
Bring next digit (3) of the dividend behind the 46 and repeat the process: 463 / 91

Going ahead to step 3:
If we divide 463 by 91, we get 5 and a remainder of 8.
Put 5 as the next digit of the answer. 
Result so far: 5.0
If we take 455 away from 463, we end up with 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 91

Advancing to step 4:
If we divide 89 by 91, we get 0 and a remainder of 89.
Record the quotient 0 as the next digit in the result. 
Result so far: 50.0
If we take 0 away from 89, we end up with 89.
Grab the next digit (0) from the dividend, add it to 89, then carry on: 890 / 91

Moving on to step 5:
91 goes into 890 9 times with a remainder of 71.
Put 9 as the next digit of the answer. 
Result so far: 509.0
If we take 819 away from 890, we end up with 71.
Grab the next digit (2) from the dividend, add it to 71, then carry on: 712 / 91

Let's proceed to step 6:
91 goes into 712 7 times with a remainder of 75.
Use 7 as the next digit of our solution. 
Result so far: 5097.0
If we subtract 637 from 712, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Let's proceed to step 7:
When dividing 750 by 91, we get 8 with a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 5097.8
If we subtract 728 from 750, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Moving on to step 8:
If we divide 220 by 91, we get 2 and a remainder of 38.
Write down 2 as next digit of the result. 
Result so far: 5097.82
Deduct 182 from 220 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 9:
The number 91 fits into 380 4 times, leaving a remainder of 16.
The next digit of our result is 4. 
Result so far: 5097.824
The remainder is 16 after subtracting 364 from 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 10:
91 goes into 160 1 times with a remainder of 69.
Use 1 as the next digit of our solution. 
Result so far: 5097.8241
If we take 91 away from 160, we end up with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Moving on to step 11:
The number 91 fits into 690 7 times, leaving a remainder of 53.
The number 7 becomes the next digit in our result. 
Result so far: 5097.82417
Deduct 637 from 690 and we're left with 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Step 12:
530 divided by 91 is 5 with a remainder of 75.
Put 5 as the next digit of the answer. 
Result so far: 5097.824175
Subtract 455 from 530 to get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

On to step 13:
If we divide 750 by 91, we get 8 and a remainder of 22.
Write down 8 as next digit of the result. 
Result so far: 5097.8241758
If we take 728 away from 750, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 14:
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: 5097.82417582
Subtract 182 from 220 to 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.

After the division, we end up with 5097.82417582 and a remainder of 3.8e-08.