Let's divide 399384 by 12
We're looking to find how many times 12 goes into 399384.

Step 1:
12 can be fit into 3 0 times, resulting in a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 12

On to step 2:
The number 12 fits into 39 3 times, leaving a remainder of 3.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 36 from 39 to get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 12

On to step 3:
39 divided by 12 is 3 with a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
The remainder is 3 after subtracting 36 from 39.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 12

Let's proceed to step 4:
The number 12 fits into 33 2 times, leaving a remainder of 9.
Record the quotient 2 as the next digit in the result. 
Result so far: 332.0
Deduct 24 from 33 and we're left with 9.
Append the next digit (8) from the dividend to 9 and continue with: 98 / 12

On to step 5:
The number 12 fits into 98 8 times, leaving a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 3328.0
If we take 96 away from 98, we end up with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 12

Advancing to step 6:
12 can be fit into 24 2 times, resulting in a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 33282.0
The remainder is 0 after subtracting 24 from 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 7:
12 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 33282.0
Subtracting 0 from 0 leaves us 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.

Step 8:
12 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 33282.0
If we take 0 away from 0, we end up 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.

In conclusion, the division gives 33282.0 with a balance of 0.0.