789428 divided by 18 
The aim is to understand the frequency of 18 in 789428.

On to step 1:
18 can be fit into 7 0 times, resulting in a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 18

Moving on to step 2:
If we divide 78 by 18, we get 4 and a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 72 from 78, we get 6.
Take the next digit (9) from the dividend and append it to 6, then repeat: 69 / 18

Step 3:
If we divide 69 by 18, we get 3 and a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 43.0
If we take 54 away from 69, we end up with 15.
Bring next digit (4) of the dividend behind the 15 and repeat the process: 154 / 18

Moving on to step 4:
If we divide 154 by 18, we get 8 and a remainder of 10.
Write down 8 as next digit of the result. 
Result so far: 438.0
Deduct 144 from 154 and we're left with 10.
Fetch the next digit (2) from the dividend, attach it to 10 and continue: 102 / 18

Let's proceed to step 5:
18 can be fit into 102 5 times, resulting in a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 4385.0
Subtract 90 from 102 to get 12.
Include the next digit (8) from the dividend after 12, then repeat: 128 / 18

Advancing to step 6:
128 divided by 18 is 7 with a remainder of 2.
The next digit of our result is 7. 
Result so far: 43857.0
Subtract 126 from 128 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 7:
18 can be fit into 20 1 times, resulting in a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 43857.1
If we take 18 away from 20, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 8:
18 goes into 20 1 times with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 43857.11
Subtracting 18 from 20 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 43857.11 and a remainder of 0.002.