Let's divide 399512 by 19
We're looking to find how many times 19 goes into 399512.

On to step 1:
If we divide 3 by 19, we get 0 and 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 (9) from the dividend after 3, then repeat: 39 / 19

On to step 2:
When dividing 39 by 19, we get 2 with a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Deduct 38 from 39 and we're left with 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 19

On to step 3:
19 can be fit into 19 1 times, resulting in a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 21.0
If we subtract 19 from 19, we get 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 19

Step 4:
19 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 210.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 19

Let's proceed to step 5:
The number 19 fits into 51 2 times, leaving a remainder of 13.
Use 2 as the next digit of our solution. 
Result so far: 2102.0
Deduct 38 from 51 and we're left with 13.
Bring next digit (2) of the dividend behind the 13 and repeat the process: 132 / 19

Moving on to step 6:
The number 19 fits into 132 6 times, leaving a remainder of 18.
The number 6 becomes the next digit in our result. 
Result so far: 21026.0
Subtracting 114 from 132 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 7:
19 goes into 180 9 times with a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 21026.9
Subtract 171 from 180 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.

Moving on to step 8:
The number 19 fits into 90 4 times, leaving a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 21026.94
The remainder is 14 after subtracting 76 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 9:
The number 19 fits into 140 7 times, leaving a remainder of 7.
Put 7 as the next digit of the answer. 
Result so far: 21026.947
If we take 133 away from 140, we end up with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 10:
The number 19 fits into 70 3 times, leaving a remainder of 13.
Use 3 as the next digit of our solution. 
Result so far: 21026.9473
If we subtract 57 from 70, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 11:
19 goes into 130 6 times with a remainder of 16.
The number 6 becomes the next digit in our result. 
Result so far: 21026.94736
If we take 114 away from 130, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 12:
160 divided by 19 is 8 with a remainder of 8.
The number 8 becomes the next digit in our result. 
Result so far: 21026.947368
The remainder is 8 after subtracting 152 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 13:
19 goes into 80 4 times with a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 21026.9473684
If we subtract 76 from 80, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 14:
19 can be fit into 40 2 times, resulting in a remainder of 2.
The next digit of our result is 2. 
Result so far: 21026.94736842
The remainder is 2 after subtracting 38 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 21026.94736842, with a leftover of 2e-09.