We look at the division of 390008 by 18 
We're looking to find how many times 18 goes into 390008.

On to 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
Subtract 0 from 3 to get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 18

Going ahead to step 2:
If we divide 39 by 18, we get 2 and a remainder of 3.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 36 from 39, we get 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 18

On to step 3:
If we divide 30 by 18, we get 1 and a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 21.0
If we take 18 away from 30, we end up with 12.
Grab the next digit (0) from the dividend, add it to 12, then carry on: 120 / 18

Moving on to step 4:
When dividing 120 by 18, we get 6 with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 216.0
If we take 108 away from 120, we end up with 12.
Grab the next digit (0) from the dividend, add it to 12, then carry on: 120 / 18

Advancing to step 5:
The number 18 fits into 120 6 times, leaving a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 2166.0
Deduct 108 from 120 and we're left with 12.
Bring next digit (8) of the dividend behind the 12 and repeat the process: 128 / 18

Advancing to step 6:
18 can be fit into 128 7 times, resulting in a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 21667.0
If we subtract 126 from 128, 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.

Going ahead to step 7:
When dividing 20 by 18, we get 1 with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 21667.1
Subtract 18 from 20 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.

Moving on to step 8:
When dividing 20 by 18, we get 1 with a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 21667.11
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.

The final result is 21667.11 with a remainder of 0.002.