391693 ÷ 91 
The aim is to understand the frequency of 91 in 391693.

Going ahead to step 1:
3 divided by 91 is 0 with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 91

Let's proceed to step 2:
91 can be fit into 39 0 times, resulting in a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Append the next digit (1) from the dividend to 39 and continue with: 391 / 91

Moving on to step 3:
391 divided by 91 is 4 with a remainder of 27.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 364 away from 391, we end up with 27.
Grab the next digit (6) from the dividend, add it to 27, then carry on: 276 / 91

Going ahead to step 4:
When dividing 276 by 91, we get 3 with a remainder of 3.
The next digit of our result is 3. 
Result so far: 43.0
Deduct 273 from 276 and we're left with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 91

Going ahead to step 5:
39 divided by 91 is 0 with a remainder of 39.
The next digit of our result is 0. 
Result so far: 430.0
Subtract 0 from 39 to get 39.
Fetch the next digit (3) from the dividend, attach it to 39 and continue: 393 / 91

On to step 6:
91 goes into 393 4 times with a remainder of 29.
Use 4 as the next digit of our solution. 
Result so far: 4304.0
Deduct 364 from 393 and we're left 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.

Step 7:
The number 91 fits into 290 3 times, leaving a remainder of 17.
The next digit of our result is 3. 
Result so far: 4304.3
If we take 273 away from 290, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 8:
The number 91 fits into 170 1 times, leaving a remainder of 79.
Record the quotient 1 as the next digit in the result. 
Result so far: 4304.31
Deduct 91 from 170 and we're left with 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Going ahead to step 9:
91 can be fit into 790 8 times, resulting in a remainder of 62.
The number 8 becomes the next digit in our result. 
Result so far: 4304.318
Deduct 728 from 790 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.

Let's proceed to step 10:
91 goes into 620 6 times with a remainder of 74.
The number 6 becomes the next digit in our result. 
Result so far: 4304.3186
Deduct 546 from 620 and we're left 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.

Advancing to step 11:
When dividing 740 by 91, we get 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 4304.31868
Subtract 728 from 740 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 12:
If we divide 120 by 91, we get 1 and a remainder of 29.
Write down 1 as next digit of the result. 
Result so far: 4304.318681
The remainder is 29 after subtracting 91 from 120.
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 13:
91 goes into 290 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 4304.3186813
Subtracting 273 from 290 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 14:
If we divide 170 by 91, we get 1 and a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 4304.31868131
If we subtract 91 from 170, we 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.

The final outcome is 4304.31868131, with a leftover of 7.9e-08.