We look at the division of 99113107 by 813 
The aim is to understand the frequency of 813 in 99113107.

Let's proceed to step 1:
9 divided by 813 is 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 813

Let's proceed to step 2:
813 can be fit into 99 0 times, resulting in a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 99 to get 99.
Fetch the next digit (1) from the dividend, attach it to 99 and continue: 991 / 813

Going ahead to step 3:
991 divided by 813 is 1 with a remainder of 178.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 813 from 991 and we're left with 178.
Append the next digit (1) from the dividend to 178 and continue with: 1781 / 813

On to step 4:
813 goes into 1781 2 times with a remainder of 155.
Put 2 as the next digit of the answer. 
Result so far: 12.0
The remainder is 155 after subtracting 1626 from 1781.
Include the next digit (3) from the dividend after 155, then repeat: 1553 / 813

Let's proceed to step 5:
813 goes into 1553 1 times with a remainder of 740.
Use 1 as the next digit of our solution. 
Result so far: 121.0
Subtract 813 from 1553 to get 740.
Take the next digit (1) from the dividend and append it to 740, then repeat: 7401 / 813

On to step 6:
If we divide 7401 by 813, we get 9 and a remainder of 84.
The next digit of our result is 9. 
Result so far: 1219.0
Deduct 7317 from 7401 and we're left with 84.
Include the next digit (0) from the dividend after 84, then repeat: 840 / 813

Going ahead to step 7:
If we divide 840 by 813, we get 1 and a remainder of 27.
Write down 1 as next digit of the result. 
Result so far: 12191.0
Subtract 813 from 840 to get 27.
Fetch the next digit (7) from the dividend, attach it to 27 and continue: 277 / 813

Moving on to step 8:
If we divide 277 by 813, we get 0 and a remainder of 277.
Write down 0 as next digit of the result. 
Result so far: 121910.0
If we subtract 0 from 277, we get 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Let's proceed to step 9:
The number 813 fits into 2770 3 times, leaving a remainder of 331.
The number 3 becomes the next digit in our result. 
Result so far: 121910.3
The remainder is 331 after subtracting 2439 from 2770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

Step 10:
813 goes into 3310 4 times with a remainder of 58.
Put 4 as the next digit of the answer. 
Result so far: 121910.34
The remainder is 58 after subtracting 3252 from 3310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 11:
580 divided by 813 is 0 with a remainder of 580.
Use 0 as the next digit of our solution. 
Result so far: 121910.34
Subtract 0 from 580 to get 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

On to step 12:
When dividing 5800 by 813, we get 7 with a remainder of 109.
Use 7 as the next digit of our solution. 
Result so far: 121910.3407
Subtract 5691 from 5800 to get 109.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Step 13:
The number 813 fits into 1090 1 times, leaving a remainder of 277.
Use 1 as the next digit of our solution. 
Result so far: 121910.34071
Subtract 813 from 1090 to get 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Moving on to step 14:
When dividing 2770 by 813, we get 3 with a remainder of 331.
The number 3 becomes the next digit in our result. 
Result so far: 121910.340713
Subtracting 2439 from 2770 leaves us with 331.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3310, and continue the process.

Moving on to step 15:
813 can be fit into 3310 4 times, resulting in a remainder of 58.
Put 4 as the next digit of the answer. 
Result so far: 121910.3407134
If we take 3252 away from 3310, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 16:
The number 813 fits into 580 0 times, leaving a remainder of 580.
The next digit of our result is 0. 
Result so far: 121910.3407134
The remainder is 580 after subtracting 0 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

The final outcome is 121910.3407134, with a leftover of 5.8e-07.