We're dividing 181209 by 11 
The aim is to understand the frequency of 11 in 181209.

Advancing to step 1:
When dividing 1 by 11, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 11

Step 2:
The number 11 fits into 18 1 times, leaving a remainder of 7.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 11 from 18 and we're left with 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 11

Moving on to step 3:
The number 11 fits into 71 6 times, leaving a remainder of 5.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Subtract 66 from 71 to get 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 11

Advancing to step 4:
If we divide 52 by 11, we get 4 and a remainder of 8.
The next digit of our result is 4. 
Result so far: 164.0
If we take 44 away from 52, we end up with 8.
Take the next digit (0) from the dividend and append it to 8, then repeat: 80 / 11

Step 5:
When dividing 80 by 11, we get 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 1647.0
Deduct 77 from 80 and we're left with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 11

On to step 6:
11 goes into 39 3 times with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 16473.0
Subtract 33 from 39 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 7:
If we divide 60 by 11, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 16473.5
Deduct 55 from 60 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 8:
50 divided by 11 is 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 16473.54
If we subtract 44 from 50, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 9:
11 can be fit into 60 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 16473.545
The remainder is 5 after subtracting 55 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 10:
When dividing 50 by 11, we get 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 16473.5454
Deduct 44 from 50 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 11:
11 can be fit into 60 5 times, resulting in a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 16473.54545
Deduct 55 from 60 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 12:
11 can be fit into 50 4 times, resulting in a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 16473.545454
Deduct 44 from 50 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 13:
11 goes into 60 5 times with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 16473.5454545
Deduct 55 from 60 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Let's proceed to step 14:
When dividing 50 by 11, we get 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 16473.54545454
Subtracting 44 from 50 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

The final outcome is 16473.54545454, with a leftover of 6e-09.