We look at the division of 396893 by 91 
The aim is to understand the frequency of 91 in 396893.

Step 1:
When dividing 3 by 91, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 91

Step 2:
39 divided by 91 is 0 with a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 39 leaves us with 39.
Bring next digit (6) of the dividend behind the 39 and repeat the process: 396 / 91

Let's proceed to step 3:
When dividing 396 by 91, we get 4 with a remainder of 32.
The next digit of our result is 4. 
Result so far: 4.0
Deduct 364 from 396 and we're left with 32.
Take the next digit (8) from the dividend and append it to 32, then repeat: 328 / 91

On to step 4:
If we divide 328 by 91, we get 3 and a remainder of 55.
The next digit of our result is 3. 
Result so far: 43.0
The remainder is 55 after subtracting 273 from 328.
Take the next digit (9) from the dividend and append it to 55, then repeat: 559 / 91

On to step 5:
91 goes into 559 6 times with a remainder of 13.
The next digit of our result is 6. 
Result so far: 436.0
If we take 546 away from 559, we end up with 13.
Include the next digit (3) from the dividend after 13, then repeat: 133 / 91

Step 6:
133 divided by 91 is 1 with a remainder of 42.
Record the quotient 1 as the next digit in the result. 
Result so far: 4361.0
Deduct 91 from 133 and we're left with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Advancing to step 7:
When dividing 420 by 91, we get 4 with a remainder of 56.
Record the quotient 4 as the next digit in the result. 
Result so far: 4361.4
Subtracting 364 from 420 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 8:
560 divided by 91 is 6 with a remainder of 14.
Put 6 as the next digit of the answer. 
Result so far: 4361.46
Subtracting 546 from 560 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 9:
91 goes into 140 1 times with a remainder of 49.
Use 1 as the next digit of our solution. 
Result so far: 4361.461
Subtract 91 from 140 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

On to step 10:
490 divided by 91 is 5 with a remainder of 35.
Record the quotient 5 as the next digit in the result. 
Result so far: 4361.4615
The remainder is 35 after subtracting 455 from 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

On to step 11:
If we divide 350 by 91, we get 3 and a remainder of 77.
The number 3 becomes the next digit in our result. 
Result so far: 4361.46153
If we take 273 away from 350, we end up with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

On to step 12:
If we divide 770 by 91, we get 8 and a remainder of 42.
Record the quotient 8 as the next digit in the result. 
Result so far: 4361.461538
The remainder is 42 after subtracting 728 from 770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 13:
If we divide 420 by 91, we get 4 and a remainder of 56.
Record the quotient 4 as the next digit in the result. 
Result so far: 4361.4615384
Subtracting 364 from 420 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 14:
91 goes into 560 6 times with a remainder of 14.
Write down 6 as next digit of the result. 
Result so far: 4361.46153846
The remainder is 14 after subtracting 546 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 4361.46153846, with a leftover of 1.4e-08.