We look at the division of 303804 by 18 
Let's see how many times 18 fits into 303804.

Step 1:
18 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 18

On to step 2:
18 goes into 30 1 times with a remainder of 12.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 18 from 30, we get 12.
Bring next digit (3) of the dividend behind the 12 and repeat the process: 123 / 18

Step 3:
18 goes into 123 6 times with a remainder of 15.
The next digit of our result is 6. 
Result so far: 16.0
If we subtract 108 from 123, we get 15.
Fetch the next digit (8) from the dividend, attach it to 15 and continue: 158 / 18

On to step 4:
The number 18 fits into 158 8 times, leaving a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 168.0
Deduct 144 from 158 and we're left with 14.
Append the next digit (0) from the dividend to 14 and continue with: 140 / 18

Step 5:
140 divided by 18 is 7 with a remainder of 14.
Record the quotient 7 as the next digit in the result. 
Result so far: 1687.0
If we take 126 away from 140, we end up with 14.
Take the next digit (4) from the dividend and append it to 14, then repeat: 144 / 18

On to step 6:
The number 18 fits into 144 8 times, leaving a remainder of 0.
Record the quotient 8 as the next digit in the result. 
Result so far: 16878.0
The remainder is 0 after subtracting 144 from 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 7:
The number 18 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 16878.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 8:
The number 18 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 16878.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 16878.0 with a remaining 0.0.