We divide 398351 by 1
We're looking to find how many times 1 goes into 398351.

Advancing to step 1:
If we divide 3 by 1, we get 3 and a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3.0
If we take 3 away from 3, we end up with 0.
Grab the next digit (9) from the dividend, add it to 0, then carry on: 9 / 1

Step 2:
If we divide 9 by 1, we get 9 and a remainder of 0.
The next digit of our result is 9. 
Result so far: 39.0
Subtracting 9 from 9 leaves us with 0.
Fetch the next digit (8) from the dividend, attach it to 0 and continue: 8 / 1

Moving on to step 3:
When dividing 8 by 1, we get 8 with a remainder of 0.
Write down 8 as next digit of the result. 
Result so far: 398.0
If we subtract 8 from 8, we get 0.
Bring next digit (3) of the dividend behind the 0 and repeat the process: 3 / 1

On to step 4:
1 goes into 3 3 times with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 3983.0
If we subtract 3 from 3, we get 0.
Bring next digit (5) of the dividend behind the 0 and repeat the process: 5 / 1

Going ahead to step 5:
1 can be fit into 5 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 39835.0
If we subtract 5 from 5, we get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 1

On to step 6:
The number 1 fits into 1 1 times, leaving a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 398351.0
If we take 1 away from 1, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
1 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 398351.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
The number 1 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 398351.0
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 398351.0 and a remainder of 0.0.