We're dividing 403669 by 18 
The aim is to understand the frequency of 18 in 403669.

Let's proceed 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
If we subtract 0 from 4, we get 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 18

Moving on to step 2:
18 can be fit into 40 2 times, resulting in a remainder of 4.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 36 from 40, we get 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 18

Let's proceed to step 3:
If we divide 43 by 18, we get 2 and a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 22.0
Subtracting 36 from 43 leaves us with 7.
Fetch the next digit (6) from the dividend, attach it to 7 and continue: 76 / 18

Advancing to step 4:
The number 18 fits into 76 4 times, leaving a remainder of 4.
Record the quotient 4 as the next digit in the result. 
Result so far: 224.0
Subtract 72 from 76 to get 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 18

On to step 5:
The number 18 fits into 46 2 times, leaving a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 2242.0
If we subtract 36 from 46, we get 10.
Include the next digit (9) from the dividend after 10, then repeat: 109 / 18

Advancing to step 6:
18 can be fit into 109 6 times, resulting in a remainder of 1.
The next digit of our result is 6. 
Result so far: 22426.0
If we subtract 108 from 109, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 7:
If we divide 10 by 18, we get 0 and a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 22426.0
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
The number 18 fits into 100 5 times, leaving a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 22426.05
Subtract 90 from 100 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
18 can be fit into 100 5 times, resulting in a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 22426.055
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The quotient of the division is 22426.055, and the remainder is 0.001.