We look at the division of 399978 by 2 
Let's see how many times 2 fits into 399978.

Let's proceed to step 1:
2 goes into 3 1 times with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 2 from 3 and we're left with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 2

Step 2:
2 can be fit into 19 9 times, resulting in a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 19.0
Subtracting 18 from 19 leaves us with 1.
Take the next digit (9) from the dividend and append it to 1, then repeat: 19 / 2

Moving on to step 3:
2 goes into 19 9 times with a remainder of 1.
The next digit of our result is 9. 
Result so far: 199.0
Deduct 18 from 19 and we're left with 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 2

Going ahead to step 4:
2 goes into 19 9 times with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 1999.0
If we subtract 18 from 19, we get 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 2

Step 5:
2 can be fit into 17 8 times, resulting in a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 19998.0
Deduct 16 from 17 and we're left with 1.
Fetch the next digit (8) from the dividend, attach it to 1 and continue: 18 / 2

Step 6:
If we divide 18 by 2, we get 9 and a remainder of 0.
The next digit of our result is 9. 
Result so far: 199989.0
Subtract 18 from 18 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
When dividing 0 by 2, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 199989.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 8:
2 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 199989.0
The remainder is 0 after subtracting 0 from 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 199989.0 and a remainder of 0.0.