Let's divide 486393 by 18
The aim is to understand the frequency of 18 in 486393.

Let's proceed to step 1:
The number 18 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Bring next digit (8) of the dividend behind the 4 and repeat the process: 48 / 18

Moving on to step 2:
When dividing 48 by 18, we get 2 with a remainder of 12.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 12 after subtracting 36 from 48.
Bring next digit (6) of the dividend behind the 12 and repeat the process: 126 / 18

Let's proceed to step 3:
When dividing 126 by 18, we get 7 with a remainder of 0.
Put 7 as the next digit of the answer. 
Result so far: 27.0
Subtract 126 from 126 to get 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 18

Step 4:
The number 18 fits into 3 0 times, leaving a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 270.0
If we subtract 0 from 3, we get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 18

Moving on to step 5:
If we divide 39 by 18, we get 2 and a remainder of 3.
The next digit of our result is 2. 
Result so far: 2702.0
The remainder is 3 after subtracting 36 from 39.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 18

On to step 6:
If we divide 33 by 18, we get 1 and a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 27021.0
If we subtract 18 from 33, we get 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:
The number 18 fits into 150 8 times, leaving a remainder of 6.
Write down 8 as next digit of the result. 
Result so far: 27021.8
Deduct 144 from 150 and we're left 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.

Moving on to step 8:
The number 18 fits into 60 3 times, leaving a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 27021.83
Deduct 54 from 60 and we're left 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.

Step 9:
60 divided by 18 is 3 with a remainder of 6.
Record the quotient 3 as the next digit in the result. 
Result so far: 27021.833
The remainder is 6 after subtracting 54 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

After the division, we end up with 27021.833 and a remainder of 0.0006.