We look at the division of 399626 by 51 
Let's see how many times 51 fits into 399626.

Going ahead to step 1:
When dividing 3 by 51, we get 0 with a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 51

On to step 2:
51 can be fit into 39 0 times, resulting in a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Bring next digit (9) of the dividend behind the 39 and repeat the process: 399 / 51

Going ahead to step 3:
51 goes into 399 7 times with a remainder of 42.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
If we take 357 away from 399, we end up with 42.
Fetch the next digit (6) from the dividend, attach it to 42 and continue: 426 / 51

On to step 4:
If we divide 426 by 51, we get 8 and a remainder of 18.
Use 8 as the next digit of our solution. 
Result so far: 78.0
Subtracting 408 from 426 leaves us with 18.
Include the next digit (2) from the dividend after 18, then repeat: 182 / 51

Step 5:
If we divide 182 by 51, we get 3 and a remainder of 29.
Put 3 as the next digit of the answer. 
Result so far: 783.0
Subtract 153 from 182 to get 29.
Grab the next digit (6) from the dividend, add it to 29, then carry on: 296 / 51

Going ahead to step 6:
If we divide 296 by 51, we get 5 and a remainder of 41.
The next digit of our result is 5. 
Result so far: 7835.0
The remainder is 41 after subtracting 255 from 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Going ahead to step 7:
When dividing 410 by 51, we get 8 with a remainder of 2.
Record the quotient 8 as the next digit in the result. 
Result so far: 7835.8
Subtract 408 from 410 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 8:
51 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 7835.8
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
200 divided by 51 is 3 with a remainder of 47.
The next digit of our result is 3. 
Result so far: 7835.803
Subtract 153 from 200 to get 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Going ahead to step 10:
470 divided by 51 is 9 with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 7835.8039
If we subtract 459 from 470, we get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 11:
If we divide 110 by 51, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 7835.80392
The remainder is 8 after subtracting 102 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 12:
The number 51 fits into 80 1 times, leaving a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 7835.803921
If we subtract 51 from 80, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 13:
If we divide 290 by 51, we get 5 and a remainder of 35.
The next digit of our result is 5. 
Result so far: 7835.8039215
If we subtract 255 from 290, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Step 14:
51 can be fit into 350 6 times, resulting in a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 7835.80392156
If we subtract 306 from 350, we get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

The final result is 7835.80392156 with a remainder of 4.4e-08.