We divide 229137 by 18
The aim is to understand the frequency of 18 in 229137.

Step 1:
The number 18 fits into 2 0 times, leaving a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 18

On to step 2:
When dividing 22 by 18, we get 1 with a remainder of 4.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Deduct 18 from 22 and we're left with 4.
Bring next digit (9) of the dividend behind the 4 and repeat the process: 49 / 18

On to step 3:
49 divided by 18 is 2 with a remainder of 13.
The next digit of our result is 2. 
Result so far: 12.0
Subtract 36 from 49 to get 13.
Include the next digit (1) from the dividend after 13, then repeat: 131 / 18

Going ahead to step 4:
If we divide 131 by 18, we get 7 and a remainder of 5.
The next digit of our result is 7. 
Result so far: 127.0
If we subtract 126 from 131, we get 5.
Include the next digit (3) from the dividend after 5, then repeat: 53 / 18

Advancing to step 5:
The number 18 fits into 53 2 times, leaving a remainder of 17.
The number 2 becomes the next digit in our result. 
Result so far: 1272.0
Subtract 36 from 53 to get 17.
Fetch the next digit (7) from the dividend, attach it to 17 and continue: 177 / 18

Advancing to step 6:
18 goes into 177 9 times with a remainder of 15.
Put 9 as the next digit of the answer. 
Result so far: 12729.0
If we subtract 162 from 177, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 7:
18 can be fit into 150 8 times, resulting in a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 12729.8
The remainder is 6 after subtracting 144 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
The number 18 fits into 60 3 times, leaving a remainder of 6.
Put 3 as the next digit of the answer. 
Result so far: 12729.83
The remainder is 6 after subtracting 54 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
The number 18 fits into 60 3 times, leaving a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 12729.833
Deduct 54 from 60 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.

The final outcome is 12729.833, with a leftover of 0.0006.