We look at the division of 398915 by 17 
Our goal is to divide 398915 by 17.

Moving on to step 1:
The number 17 fits into 3 0 times, leaving a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Append the next digit (9) from the dividend to 3 and continue with: 39 / 17

On to step 2:
17 can be fit into 39 2 times, resulting in a remainder of 5.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Subtract 34 from 39 to get 5.
Fetch the next digit (8) from the dividend, attach it to 5 and continue: 58 / 17

Going ahead to step 3:
The number 17 fits into 58 3 times, leaving a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 23.0
Subtract 51 from 58 to get 7.
Fetch the next digit (9) from the dividend, attach it to 7 and continue: 79 / 17

Advancing to step 4:
If we divide 79 by 17, we get 4 and a remainder of 11.
Write down 4 as next digit of the result. 
Result so far: 234.0
Subtract 68 from 79 to get 11.
Grab the next digit (1) from the dividend, add it to 11, then carry on: 111 / 17

On to step 5:
17 can be fit into 111 6 times, resulting in a remainder of 9.
Put 6 as the next digit of the answer. 
Result so far: 2346.0
Subtracting 102 from 111 leaves us with 9.
Grab the next digit (5) from the dividend, add it to 9, then carry on: 95 / 17

On to step 6:
17 goes into 95 5 times with a remainder of 10.
Write down 5 as next digit of the result. 
Result so far: 23465.0
Deduct 85 from 95 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 7:
The number 17 fits into 100 5 times, leaving a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 23465.5
If we subtract 85 from 100, we 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.

Advancing to step 8:
When dividing 150 by 17, we get 8 with a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 23465.58
Deduct 136 from 150 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 9:
The number 17 fits into 140 8 times, leaving a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 23465.588
If we subtract 136 from 140, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final result is 23465.588 with a remainder of 0.0004.