639344 ÷ 4 
We want to divide 639344 by 4.

Advancing to step 1:
If we divide 6 by 4, we get 1 and a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 4 from 6 leaves us with 2.
Include the next digit (3) from the dividend after 2, then repeat: 23 / 4

Going ahead to step 2:
4 goes into 23 5 times with a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 15.0
Subtract 20 from 23 to get 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 4

On to step 3:
4 can be fit into 39 9 times, resulting in a remainder of 3.
The next digit of our result is 9. 
Result so far: 159.0
Deduct 36 from 39 and we're left with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 4

Step 4:
If we divide 33 by 4, we get 8 and a remainder of 1.
Write down 8 as next digit of the result. 
Result so far: 1598.0
If we take 32 away from 33, we end up with 1.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 4

Let's proceed to step 5:
4 can be fit into 14 3 times, resulting in a remainder of 2.
Record the quotient 3 as the next digit in the result. 
Result so far: 15983.0
If we subtract 12 from 14, we get 2.
Fetch the next digit (4) from the dividend, attach it to 2 and continue: 24 / 4

Let's proceed to step 6:
If we divide 24 by 4, we get 6 and a remainder of 0.
Put 6 as the next digit of the answer. 
Result so far: 159836.0
Deduct 24 from 24 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 7:
The number 4 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 159836.0
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.

Going ahead to step 8:
4 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 159836.0
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 159836.0 and a remainder of 0.0.