We look at the division of 431924 by 18 
The aim is to understand the frequency of 18 in 431924.

Moving on to step 1:
If we divide 4 by 18, we get 0 and a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 18

Let's proceed to step 2:
18 goes into 43 2 times with a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 36 away from 43, we end up with 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 18

Step 3:
If we divide 71 by 18, we get 3 and a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
The remainder is 17 after subtracting 54 from 71.
Take the next digit (9) from the dividend and append it to 17, then repeat: 179 / 18

Advancing to step 4:
18 can be fit into 179 9 times, resulting in a remainder of 17.
The number 9 becomes the next digit in our result. 
Result so far: 239.0
Subtracting 162 from 179 leaves us with 17.
Fetch the next digit (2) from the dividend, attach it to 17 and continue: 172 / 18

On to step 5:
When dividing 172 by 18, we get 9 with a remainder of 10.
Put 9 as the next digit of the answer. 
Result so far: 2399.0
The remainder is 10 after subtracting 162 from 172.
Append the next digit (4) from the dividend to 10 and continue with: 104 / 18

Let's proceed to step 6:
The number 18 fits into 104 5 times, leaving a remainder of 14.
The next digit of our result is 5. 
Result so far: 23995.0
Subtracting 90 from 104 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 7:
18 can be fit into 140 7 times, resulting in a remainder of 14.
The number 7 becomes the next digit in our result. 
Result so far: 23995.7
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 8:
140 divided by 18 is 7 with a remainder of 14.
The next digit of our result is 7. 
Result so far: 23995.77
Deduct 126 from 140 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 23995.77, with a leftover of 0.014.