180901 divided by 11 
The aim is to understand the frequency of 11 in 180901.

Moving on to step 1:
If we divide 1 by 11, 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.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 11

Going ahead to step 2:
The number 11 fits into 18 1 times, leaving a remainder of 7.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 11 away from 18, we end up with 7.
Fetch the next digit (0) from the dividend, attach it to 7 and continue: 70 / 11

Advancing to step 3:
70 divided by 11 is 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 16.0
If we take 66 away from 70, we end up with 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 11

On to step 4:
11 can be fit into 49 4 times, resulting in a remainder of 5.
Put 4 as the next digit of the answer. 
Result so far: 164.0
Subtracting 44 from 49 leaves us with 5.
Fetch the next digit (0) from the dividend, attach it to 5 and continue: 50 / 11

Moving on to step 5:
The number 11 fits into 50 4 times, leaving a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 1644.0
Deduct 44 from 50 and we're left with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 11

On to step 6:
61 divided by 11 is 5 with a remainder of 6.
Write down 5 as next digit of the result. 
Result so far: 16445.0
Deduct 55 from 61 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 7:
The number 11 fits into 60 5 times, leaving a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 16445.5
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.

On to step 8:
11 goes into 50 4 times with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 16445.54
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.

Let's proceed to step 9:
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: 16445.545
If we subtract 55 from 60, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 10:
11 goes into 50 4 times with a remainder of 6.
The next digit of our result is 4. 
Result so far: 16445.5454
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.

On to step 11:
The number 11 fits into 60 5 times, leaving a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 16445.54545
If we take 55 away from 60, we end up 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.

Moving on to step 12:
When dividing 50 by 11, we get 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 16445.545454
The remainder is 6 after subtracting 44 from 50.
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 13:
60 divided by 11 is 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 16445.5454545
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.

Advancing to step 14:
If we divide 50 by 11, we get 4 and a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 16445.54545454
If we take 44 away from 50, we end up 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 result is 16445.54545454 with a remainder of 6e-09.