17008161 ÷ 399 
We want to divide 17008161 by 399.

Moving on to step 1:
399 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 399

Step 2:
The number 399 fits into 17 0 times, leaving a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 17, we end up with 17.
Grab the next digit (0) from the dividend, add it to 17, then carry on: 170 / 399

Step 3:
399 goes into 170 0 times with a remainder of 170.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 170 and we're left with 170.
Grab the next digit (0) from the dividend, add it to 170, then carry on: 1700 / 399

On to step 4:
If we divide 1700 by 399, we get 4 and a remainder of 104.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 1596 from 1700, we get 104.
Grab the next digit (8) from the dividend, add it to 104, then carry on: 1048 / 399

Advancing to step 5:
The number 399 fits into 1048 2 times, leaving a remainder of 250.
Record the quotient 2 as the next digit in the result. 
Result so far: 42.0
Subtract 798 from 1048 to get 250.
Append the next digit (1) from the dividend to 250 and continue with: 2501 / 399

Step 6:
If we divide 2501 by 399, we get 6 and a remainder of 107.
Put 6 as the next digit of the answer. 
Result so far: 426.0
The remainder is 107 after subtracting 2394 from 2501.
Append the next digit (6) from the dividend to 107 and continue with: 1076 / 399

Going ahead to step 7:
When dividing 1076 by 399, we get 2 with a remainder of 278.
The number 2 becomes the next digit in our result. 
Result so far: 4262.0
If we subtract 798 from 1076, we get 278.
Fetch the next digit (1) from the dividend, attach it to 278 and continue: 2781 / 399

Advancing to step 8:
399 can be fit into 2781 6 times, resulting in a remainder of 387.
The next digit of our result is 6. 
Result so far: 42626.0
Deduct 2394 from 2781 and we're left with 387.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Step 9:
3870 divided by 399 is 9 with a remainder of 279.
Record the quotient 9 as the next digit in the result. 
Result so far: 42626.9
Subtract 3591 from 3870 to get 279.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Moving on to step 10:
The number 399 fits into 2790 6 times, leaving a remainder of 396.
The next digit of our result is 6. 
Result so far: 42626.96
If we subtract 2394 from 2790, we get 396.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

Going ahead to step 11:
When dividing 3960 by 399, we get 9 with a remainder of 369.
Put 9 as the next digit of the answer. 
Result so far: 42626.969
Deduct 3591 from 3960 and we're left with 369.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3690, and continue the process.

Let's proceed to step 12:
When dividing 3690 by 399, we get 9 with a remainder of 99.
The number 9 becomes the next digit in our result. 
Result so far: 42626.9699
Subtracting 3591 from 3690 leaves us with 99.
Since there are no more digits in the dividend, we add a zero to the remainder making it 990, and continue the process.

The quotient of the division is 42626.9699, and the remainder is 0.00099.