We divide 399849 by 12
We want to figure out the number of times 399849 can be divided by 12.

Going ahead to step 1:
If we divide 3 by 12, we get 0 and a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 12

Moving on to step 2:
When dividing 39 by 12, we get 3 with a remainder of 3.
The next digit of our result is 3. 
Result so far: 3.0
Subtract 36 from 39 to get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 12

Going ahead to step 3:
If we divide 39 by 12, we get 3 and a remainder of 3.
Write down 3 as next digit of the result. 
Result so far: 33.0
The remainder is 3 after subtracting 36 from 39.
Grab the next digit (8) from the dividend, add it to 3, then carry on: 38 / 12

Step 4:
The number 12 fits into 38 3 times, leaving a remainder of 2.
The number 3 becomes the next digit in our result. 
Result so far: 333.0
Subtract 36 from 38 to get 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 12

Let's proceed to step 5:
12 can be fit into 24 2 times, resulting in a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 3332.0
Subtracting 24 from 24 leaves us with 0.
Take the next digit (9) from the dividend and append it to 0, then repeat: 9 / 12

Step 6:
12 goes into 9 0 times with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 33320.0
Subtract 0 from 9 to get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Going ahead to step 7:
12 goes into 90 7 times with a remainder of 6.
The next digit of our result is 7. 
Result so far: 33320.7
If we take 84 away from 90, we end up with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 8:
If we divide 60 by 12, we get 5 and a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 33320.75
If we subtract 60 from 60, we get 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 9:
12 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 33320.75
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.

Let's proceed to step 10:
0 divided by 12 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 33320.75
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 33320.75 with a remainder of 0.0.