6303628 divided by 399 
Let's see how many times 399 fits into 6303628.

Going ahead to step 1:
6 divided by 399 is 0 with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 399

Going ahead to step 2:
63 divided by 399 is 0 with a remainder of 63.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 63 after subtracting 0 from 63.
Fetch the next digit (0) from the dividend, attach it to 63 and continue: 630 / 399

Step 3:
399 can be fit into 630 1 times, resulting in a remainder of 231.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 399 from 630 to get 231.
Append the next digit (3) from the dividend to 231 and continue with: 2313 / 399

Let's proceed to step 4:
399 can be fit into 2313 5 times, resulting in a remainder of 318.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
If we subtract 1995 from 2313, we get 318.
Take the next digit (6) from the dividend and append it to 318, then repeat: 3186 / 399

Step 5:
3186 divided by 399 is 7 with a remainder of 393.
Record the quotient 7 as the next digit in the result. 
Result so far: 157.0
If we take 2793 away from 3186, we end up with 393.
Fetch the next digit (2) from the dividend, attach it to 393 and continue: 3932 / 399

Advancing to step 6:
If we divide 3932 by 399, we get 9 and a remainder of 341.
The next digit of our result is 9. 
Result so far: 1579.0
Subtract 3591 from 3932 to get 341.
Grab the next digit (8) from the dividend, add it to 341, then carry on: 3418 / 399

Going ahead to step 7:
399 goes into 3418 8 times with a remainder of 226.
Put 8 as the next digit of the answer. 
Result so far: 15798.0
If we subtract 3192 from 3418, we get 226.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2260, and continue the process.

Step 8:
If we divide 2260 by 399, we get 5 and a remainder of 265.
The number 5 becomes the next digit in our result. 
Result so far: 15798.5
Subtract 1995 from 2260 to get 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

Step 9:
The number 399 fits into 2650 6 times, leaving a remainder of 256.
Write down 6 as next digit of the result. 
Result so far: 15798.56
Subtract 2394 from 2650 to get 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

Going ahead to step 10:
399 goes into 2560 6 times with a remainder of 166.
Put 6 as the next digit of the answer. 
Result so far: 15798.566
If we take 2394 away from 2560, we end up with 166.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1660, and continue the process.

Our division results in 15798.566 with a remaining 0.0166.