993308 ÷ 91 
The aim is to understand the frequency of 91 in 993308.

Let's proceed to step 1:
When dividing 9 by 91, we get 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 91

Moving on to step 2:
When dividing 99 by 91, we get 1 with a remainder of 8.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 91 from 99 to get 8.
Fetch the next digit (3) from the dividend, attach it to 8 and continue: 83 / 91

On to step 3:
83 divided by 91 is 0 with a remainder of 83.
Put 0 as the next digit of the answer. 
Result so far: 10.0
Subtracting 0 from 83 leaves us with 83.
Take the next digit (3) from the dividend and append it to 83, then repeat: 833 / 91

On to step 4:
When dividing 833 by 91, we get 9 with a remainder of 14.
Record the quotient 9 as the next digit in the result. 
Result so far: 109.0
If we subtract 819 from 833, we get 14.
Append the next digit (0) from the dividend to 14 and continue with: 140 / 91

Advancing to step 5:
140 divided by 91 is 1 with a remainder of 49.
Use 1 as the next digit of our solution. 
Result so far: 1091.0
The remainder is 49 after subtracting 91 from 140.
Include the next digit (8) from the dividend after 49, then repeat: 498 / 91

Step 6:
91 can be fit into 498 5 times, resulting in a remainder of 43.
Record the quotient 5 as the next digit in the result. 
Result so far: 10915.0
If we subtract 455 from 498, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 7:
430 divided by 91 is 4 with a remainder of 66.
Write down 4 as next digit of the result. 
Result so far: 10915.4
The remainder is 66 after subtracting 364 from 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 8:
If we divide 660 by 91, we get 7 and a remainder of 23.
Record the quotient 7 as the next digit in the result. 
Result so far: 10915.47
Deduct 637 from 660 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 9:
If we divide 230 by 91, we get 2 and a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 10915.472
Subtract 182 from 230 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Moving on to step 10:
The number 91 fits into 480 5 times, leaving a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 10915.4725
Subtracting 455 from 480 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 11:
91 can be fit into 250 2 times, resulting in a remainder of 68.
The next digit of our result is 2. 
Result so far: 10915.47252
The remainder is 68 after subtracting 182 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Advancing to step 12:
680 divided by 91 is 7 with a remainder of 43.
Record the quotient 7 as the next digit in the result. 
Result so far: 10915.472527
If we subtract 637 from 680, we get 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Let's proceed to step 13:
If we divide 430 by 91, we get 4 and a remainder of 66.
The number 4 becomes the next digit in our result. 
Result so far: 10915.4725274
If we subtract 364 from 430, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 14:
When dividing 660 by 91, we get 7 with a remainder of 23.
Record the quotient 7 as the next digit in the result. 
Result so far: 10915.47252747
If we take 637 away from 660, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

The final outcome is 10915.47252747, with a leftover of 2.3e-08.