We're dividing 423195 by 18 
The aim is to understand the frequency of 18 in 423195.

Let's proceed to step 1:
4 divided by 18 is 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Take the next digit (2) from the dividend and append it to 4, then repeat: 42 / 18

On to step 2:
42 divided by 18 is 2 with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 2.0
The remainder is 6 after subtracting 36 from 42.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 18

Advancing to step 3:
The number 18 fits into 63 3 times, leaving a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 23.0
The remainder is 9 after subtracting 54 from 63.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 18

Moving on to step 4:
91 divided by 18 is 5 with a remainder of 1.
The next digit of our result is 5. 
Result so far: 235.0
If we subtract 90 from 91, we get 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 18

Advancing to step 5:
The number 18 fits into 19 1 times, leaving a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 2351.0
Deduct 18 from 19 and we're left with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 18

On to step 6:
18 goes into 15 0 times with a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 23510.0
Subtracting 0 from 15 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 7:
If we divide 150 by 18, we get 8 and a remainder of 6.
Record the quotient 8 as the next digit in the result. 
Result so far: 23510.8
Subtracting 144 from 150 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.

Let's proceed to step 8:
If we divide 60 by 18, we get 3 and a remainder of 6.
The number 3 becomes the next digit in our result. 
Result so far: 23510.83
If we take 54 away from 60, 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.

Going ahead to step 9:
60 divided by 18 is 3 with a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 23510.833
If we take 54 away from 60, 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 23510.833 with a remainder of 0.0006.