We look at the division of 399906 by 51 
We want to divide 399906 by 51.

Step 1:
3 divided by 51 is 0 with a remainder of 3.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 51

On to step 2:
51 can be fit into 39 0 times, resulting in a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Take the next digit (9) from the dividend and append it to 39, then repeat: 399 / 51

On to step 3:
The number 51 fits into 399 7 times, leaving a remainder of 42.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 42 after subtracting 357 from 399.
Include the next digit (9) from the dividend after 42, then repeat: 429 / 51

Advancing to step 4:
429 divided by 51 is 8 with a remainder of 21.
The next digit of our result is 8. 
Result so far: 78.0
Subtracting 408 from 429 leaves us with 21.
Bring next digit (0) of the dividend behind the 21 and repeat the process: 210 / 51

On to step 5:
If we divide 210 by 51, we get 4 and a remainder of 6.
Use 4 as the next digit of our solution. 
Result so far: 784.0
Subtract 204 from 210 to get 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 51

Let's proceed to step 6:
If we divide 66 by 51, we get 1 and a remainder of 15.
Record the quotient 1 as the next digit in the result. 
Result so far: 7841.0
Subtract 51 from 66 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 7:
51 goes into 150 2 times with a remainder of 48.
Record the quotient 2 as the next digit in the result. 
Result so far: 7841.2
If we take 102 away from 150, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 8:
The number 51 fits into 480 9 times, leaving a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 7841.29
The remainder is 21 after subtracting 459 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Going ahead to step 9:
51 goes into 210 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 7841.294
Subtracting 204 from 210 leaves us 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 10:
51 goes into 60 1 times with a remainder of 9.
The next digit of our result is 1. 
Result so far: 7841.2941
Subtracting 51 from 60 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 11:
51 can be fit into 90 1 times, resulting in a remainder of 39.
Write down 1 as next digit of the result. 
Result so far: 7841.29411
The remainder is 39 after subtracting 51 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

The final outcome is 7841.29411, with a leftover of 3.9e-05.