Let's divide 820604 by 18
The aim is to understand the frequency of 18 in 820604.

Step 1:
If we divide 8 by 18, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Fetch the next digit (2) from the dividend, attach it to 8 and continue: 82 / 18

Let's proceed to step 2:
When dividing 82 by 18, we get 4 with a remainder of 10.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we subtract 72 from 82, we get 10.
Take the next digit (0) from the dividend and append it to 10, then repeat: 100 / 18

Let's proceed to step 3:
The number 18 fits into 100 5 times, leaving a remainder of 10.
Put 5 as the next digit of the answer. 
Result so far: 45.0
The remainder is 10 after subtracting 90 from 100.
Include the next digit (6) from the dividend after 10, then repeat: 106 / 18

Let's proceed to step 4:
When dividing 106 by 18, we get 5 with a remainder of 16.
Record the quotient 5 as the next digit in the result. 
Result so far: 455.0
The remainder is 16 after subtracting 90 from 106.
Take the next digit (0) from the dividend and append it to 16, then repeat: 160 / 18

Advancing to step 5:
If we divide 160 by 18, we get 8 and a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 4558.0
Subtracting 144 from 160 leaves us with 16.
Include the next digit (4) from the dividend after 16, then repeat: 164 / 18

Step 6:
164 divided by 18 is 9 with a remainder of 2.
Put 9 as the next digit of the answer. 
Result so far: 45589.0
Subtract 162 from 164 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:
20 divided by 18 is 1 with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 45589.1
If we subtract 18 from 20, we 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 8:
If we divide 20 by 18, we get 1 and a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 45589.11
The remainder is 2 after subtracting 18 from 20.
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 45589.11 and a remainder of 0.002.