18399 divided by 54 
We want to divide 18399 by 54.

Moving on to step 1:
The number 54 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 54

Moving on to step 2:
When dividing 18 by 54, we get 0 with a remainder of 18.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 18, we get 18.
Bring next digit (3) of the dividend behind the 18 and repeat the process: 183 / 54

Moving on to step 3:
54 can be fit into 183 3 times, resulting in a remainder of 21.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 162 from 183 leaves us with 21.
Take the next digit (9) from the dividend and append it to 21, then repeat: 219 / 54

Advancing to step 4:
219 divided by 54 is 4 with a remainder of 3.
The next digit of our result is 4. 
Result so far: 34.0
Subtracting 216 from 219 leaves us with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 54

Going ahead to step 5:
The number 54 fits into 39 0 times, leaving a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 340.0
The remainder is 39 after subtracting 0 from 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Step 6:
When dividing 390 by 54, we get 7 with a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 340.7
The remainder is 12 after subtracting 378 from 390.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 7:
54 goes into 120 2 times with a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 340.72
The remainder is 12 after subtracting 108 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
If we divide 120 by 54, we get 2 and a remainder of 12.
The next digit of our result is 2. 
Result so far: 340.722
If we take 108 away from 120, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The quotient of the division is 340.722, and the remainder is 0.0012.