We look at the division of 12809391 by 111 
The aim is to understand the frequency of 111 in 12809391.

Going ahead to step 1:
If we divide 1 by 111, we get 0 and a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 111

Let's proceed to step 2:
The number 111 fits into 12 0 times, leaving a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 12 after subtracting 0 from 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 111

Step 3:
The number 111 fits into 128 1 times, leaving a remainder of 17.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 111 from 128 and we're left with 17.
Take the next digit (0) from the dividend and append it to 17, then repeat: 170 / 111

Going ahead to step 4:
111 can be fit into 170 1 times, resulting in a remainder of 59.
The next digit of our result is 1. 
Result so far: 11.0
If we subtract 111 from 170, we get 59.
Bring next digit (9) of the dividend behind the 59 and repeat the process: 599 / 111

Moving on to step 5:
111 goes into 599 5 times with a remainder of 44.
Put 5 as the next digit of the answer. 
Result so far: 115.0
Subtract 555 from 599 to get 44.
Append the next digit (3) from the dividend to 44 and continue with: 443 / 111

Step 6:
111 goes into 443 3 times with a remainder of 110.
The number 3 becomes the next digit in our result. 
Result so far: 1153.0
Subtracting 333 from 443 leaves us with 110.
Fetch the next digit (9) from the dividend, attach it to 110 and continue: 1109 / 111

On to step 7:
111 goes into 1109 9 times with a remainder of 110.
The next digit of our result is 9. 
Result so far: 11539.0
Subtract 999 from 1109 to get 110.
Grab the next digit (1) from the dividend, add it to 110, then carry on: 1101 / 111

Advancing to step 8:
If we divide 1101 by 111, we get 9 and a remainder of 102.
Use 9 as the next digit of our solution. 
Result so far: 115399.0
Subtracting 999 from 1101 leaves us with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Going ahead to step 9:
111 can be fit into 1020 9 times, resulting in a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 115399.9
Deduct 999 from 1020 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

On to step 10:
111 goes into 210 1 times with a remainder of 99.
Write down 1 as next digit of the result. 
Result so far: 115399.91
Deduct 111 from 210 and we're left with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Step 11:
If we divide 990 by 111, we get 8 and a remainder of 102.
Put 8 as the next digit of the answer. 
Result so far: 115399.918
Subtracting 888 from 990 leaves us with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Let's proceed to step 12:
When dividing 1020 by 111, we get 9 with a remainder of 21.
Use 9 as the next digit of our solution. 
Result so far: 115399.9189
Subtracting 999 from 1020 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 13:
If we divide 210 by 111, we get 1 and a remainder of 99.
The number 1 becomes the next digit in our result. 
Result so far: 115399.91891
If we subtract 111 from 210, we get 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Going ahead to step 14:
If we divide 990 by 111, we get 8 and a remainder of 102.
Put 8 as the next digit of the answer. 
Result so far: 115399.918918
Subtract 888 from 990 to get 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Going ahead to step 15:
When dividing 1020 by 111, we get 9 with a remainder of 21.
The next digit of our result is 9. 
Result so far: 115399.9189189
Deduct 999 from 1020 and we're left with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 16:
If we divide 210 by 111, we get 1 and a remainder of 99.
Use 1 as the next digit of our solution. 
Result so far: 115399.91891891
Deduct 111 from 210 and we're left with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

Our division results in 115399.91891891 with a remaining 9.9e-08.