399999 divided by 30 
Our goal is to divide 399999 by 30.

Let's proceed to step 1:
When dividing 3 by 30, we get 0 with a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 30

Moving on to step 2:
If we divide 39 by 30, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtract 30 from 39 to get 9.
Fetch the next digit (9) from the dividend, attach it to 9 and continue: 99 / 30

Moving on to step 3:
If we divide 99 by 30, we get 3 and a remainder of 9.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Subtract 90 from 99 to get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 30

On to step 4:
30 can be fit into 99 3 times, resulting in a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 133.0
Deduct 90 from 99 and we're left with 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 30

Going ahead to step 5:
30 goes into 99 3 times with a remainder of 9.
Record the quotient 3 as the next digit in the result. 
Result so far: 1333.0
If we subtract 90 from 99, we get 9.
Bring next digit (9) of the dividend behind the 9 and repeat the process: 99 / 30

Going ahead to step 6:
99 divided by 30 is 3 with a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 13333.0
The remainder is 9 after subtracting 90 from 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 7:
30 goes into 90 3 times with a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 13333.3
Subtract 90 from 90 to 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.

Moving on to step 8:
The number 30 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 13333.3
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.

On to step 9:
The number 30 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 13333.3
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.

The final outcome is 13333.3, with a leftover of 0.0.