We look at the division of 433169 by 18 
The aim is to understand the frequency of 18 in 433169.

Step 1:
4 divided by 18 is 0 with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 18

Let's proceed to step 2:
The number 18 fits into 43 2 times, leaving a remainder of 7.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 36 from 43 and we're left with 7.
Include the next digit (3) from the dividend after 7, then repeat: 73 / 18

Advancing to step 3:
18 goes into 73 4 times with a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 24.0
If we subtract 72 from 73, we get 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 18

Moving on to step 4:
The number 18 fits into 11 0 times, leaving a remainder of 11.
Put 0 as the next digit of the answer. 
Result so far: 240.0
If we take 0 away from 11, we end up with 11.
Append the next digit (6) from the dividend to 11 and continue with: 116 / 18

Moving on to step 5:
When dividing 116 by 18, we get 6 with a remainder of 8.
Write down 6 as next digit of the result. 
Result so far: 2406.0
If we take 108 away from 116, we end up with 8.
Bring next digit (9) of the dividend behind the 8 and repeat the process: 89 / 18

Advancing to step 6:
The number 18 fits into 89 4 times, leaving a remainder of 17.
Use 4 as the next digit of our solution. 
Result so far: 24064.0
If we subtract 72 from 89, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 7:
170 divided by 18 is 9 with a remainder of 8.
The number 9 becomes the next digit in our result. 
Result so far: 24064.9
If we subtract 162 from 170, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 8:
18 can be fit into 80 4 times, resulting in a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 24064.94
If we take 72 away from 80, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Advancing to step 9:
When dividing 80 by 18, we get 4 with a remainder of 8.
The next digit of our result is 4. 
Result so far: 24064.944
Deduct 72 from 80 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The final outcome is 24064.944, with a leftover of 0.0008.