335215 ÷ 91 
The aim is to understand the frequency of 91 in 335215.

On to step 1:
When dividing 3 by 91, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (3) from the dividend, add it to 3, then carry on: 33 / 91

Step 2:
91 can be fit into 33 0 times, resulting in a remainder of 33.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 33 leaves us with 33.
Append the next digit (5) from the dividend to 33 and continue with: 335 / 91

Moving on to step 3:
335 divided by 91 is 3 with a remainder of 62.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 273 from 335 to get 62.
Append the next digit (2) from the dividend to 62 and continue with: 622 / 91

Moving on to step 4:
91 can be fit into 622 6 times, resulting in a remainder of 76.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
Subtract 546 from 622 to get 76.
Take the next digit (1) from the dividend and append it to 76, then repeat: 761 / 91

Advancing to step 5:
91 can be fit into 761 8 times, resulting in a remainder of 33.
Record the quotient 8 as the next digit in the result. 
Result so far: 368.0
Deduct 728 from 761 and we're left with 33.
Grab the next digit (5) from the dividend, add it to 33, then carry on: 335 / 91

Moving on to step 6:
91 can be fit into 335 3 times, resulting in a remainder of 62.
Use 3 as the next digit of our solution. 
Result so far: 3683.0
Deduct 273 from 335 and we're left with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 7:
620 divided by 91 is 6 with a remainder of 74.
The number 6 becomes the next digit in our result. 
Result so far: 3683.6
Subtracting 546 from 620 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 8:
91 goes into 740 8 times with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 3683.68
The remainder is 12 after subtracting 728 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 9:
The number 91 fits into 120 1 times, leaving a remainder of 29.
Record the quotient 1 as the next digit in the result. 
Result so far: 3683.681
If we take 91 away from 120, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 10:
When dividing 290 by 91, we get 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 3683.6813
If we subtract 273 from 290, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 11:
91 goes into 170 1 times with a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 3683.68131
Subtract 91 from 170 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 12:
The number 91 fits into 790 8 times, leaving a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 3683.681318
The remainder is 62 after subtracting 728 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 13:
91 goes into 620 6 times with a remainder of 74.
Record the quotient 6 as the next digit in the result. 
Result so far: 3683.6813186
If we take 546 away from 620, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Let's proceed to step 14:
When dividing 740 by 91, we get 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 3683.68131868
Deduct 728 from 740 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 3683.68131868 with a remainder of 1.2e-08.