1646153 divided by 399 
We're looking to find how many times 399 goes into 1646153.

Let's proceed to step 1:
If we divide 1 by 399, we get 0 and a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 399

On to step 2:
399 goes into 16 0 times with a remainder of 16.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 16 after subtracting 0 from 16.
Append the next digit (4) from the dividend to 16 and continue with: 164 / 399

Moving on to step 3:
164 divided by 399 is 0 with a remainder of 164.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 164 leaves us with 164.
Bring next digit (6) of the dividend behind the 164 and repeat the process: 1646 / 399

Step 4:
1646 divided by 399 is 4 with a remainder of 50.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 1596 from 1646 to get 50.
Include the next digit (1) from the dividend after 50, then repeat: 501 / 399

Advancing to step 5:
If we divide 501 by 399, we get 1 and a remainder of 102.
Record the quotient 1 as the next digit in the result. 
Result so far: 41.0
If we take 399 away from 501, we end up with 102.
Include the next digit (5) from the dividend after 102, then repeat: 1025 / 399

Let's proceed to step 6:
The number 399 fits into 1025 2 times, leaving a remainder of 227.
The number 2 becomes the next digit in our result. 
Result so far: 412.0
Subtracting 798 from 1025 leaves us with 227.
Bring next digit (3) of the dividend behind the 227 and repeat the process: 2273 / 399

Going ahead to step 7:
399 can be fit into 2273 5 times, resulting in a remainder of 278.
The number 5 becomes the next digit in our result. 
Result so far: 4125.0
Subtracting 1995 from 2273 leaves us with 278.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2780, and continue the process.

On to step 8:
399 can be fit into 2780 6 times, resulting in a remainder of 386.
The next digit of our result is 6. 
Result so far: 4125.6
Subtracting 2394 from 2780 leaves us with 386.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3860, and continue the process.

On to step 9:
399 can be fit into 3860 9 times, resulting in a remainder of 269.
The number 9 becomes the next digit in our result. 
Result so far: 4125.69
Subtract 3591 from 3860 to get 269.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2690, and continue the process.

On to step 10:
399 can be fit into 2690 6 times, resulting in a remainder of 296.
Put 6 as the next digit of the answer. 
Result so far: 4125.696
Deduct 2394 from 2690 and we're left with 296.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2960, and continue the process.

Going ahead to step 11:
If we divide 2960 by 399, we get 7 and a remainder of 167.
Record the quotient 7 as the next digit in the result. 
Result so far: 4125.6967
If we subtract 2793 from 2960, we get 167.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1670, and continue the process.

Going ahead to step 12:
The number 399 fits into 1670 4 times, leaving a remainder of 74.
Use 4 as the next digit of our solution. 
Result so far: 4125.69674
If we take 1596 away from 1670, we end up with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 13:
740 divided by 399 is 1 with a remainder of 341.
Record the quotient 1 as the next digit in the result. 
Result so far: 4125.696741
If we subtract 399 from 740, we get 341.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

On to step 14:
399 goes into 3410 8 times with a remainder of 218.
The next digit of our result is 8. 
Result so far: 4125.6967418
Subtracting 3192 from 3410 leaves us with 218.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2180, and continue the process.

Going ahead to step 15:
The number 399 fits into 2180 5 times, leaving a remainder of 185.
The next digit of our result is 5. 
Result so far: 4125.69674185
Subtracting 1995 from 2180 leaves us with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

The final result is 4125.69674185 with a remainder of 1.85e-07.