We look at the division of 388921 by 18 
We want to figure out the number of times 388921 can be divided by 18.

Step 1:
If we divide 3 by 18, we get 0 and a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Take the next digit (8) from the dividend and append it to 3, then repeat: 38 / 18

Moving on to step 2:
18 goes into 38 2 times with a remainder of 2.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 36 from 38 and we're left with 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 18

Moving on to step 3:
The number 18 fits into 28 1 times, leaving a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
If we subtract 18 from 28, we get 10.
Take the next digit (9) from the dividend and append it to 10, then repeat: 109 / 18

Let's proceed to step 4:
The number 18 fits into 109 6 times, leaving a remainder of 1.
Put 6 as the next digit of the answer. 
Result so far: 216.0
The remainder is 1 after subtracting 108 from 109.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 18

Going ahead to step 5:
18 can be fit into 12 0 times, resulting in a remainder of 12.
The next digit of our result is 0. 
Result so far: 2160.0
If we take 0 away from 12, we end up with 12.
Include the next digit (1) from the dividend after 12, then repeat: 121 / 18

Advancing to step 6:
If we divide 121 by 18, we get 6 and a remainder of 13.
The number 6 becomes the next digit in our result. 
Result so far: 21606.0
If we subtract 108 from 121, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
The number 18 fits into 130 7 times, leaving a remainder of 4.
The next digit of our result is 7. 
Result so far: 21606.7
Deduct 126 from 130 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 8:
When dividing 40 by 18, we get 2 with a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 21606.72
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 9:
18 goes into 40 2 times with a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 21606.722
If we subtract 36 from 40, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 21606.722, with a leftover of 0.0004.