We're dividing 639933 by 4 
We want to figure out the number of times 639933 can be divided by 4.

Step 1:
The number 4 fits into 6 1 times, leaving a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 4 from 6, we get 2.
Include the next digit (3) from the dividend after 2, then repeat: 23 / 4

Step 2:
When dividing 23 by 4, we get 5 with a remainder of 3.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
If we take 20 away from 23, we end up with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 4

Step 3:
4 can be fit into 39 9 times, resulting in a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 159.0
The remainder is 3 after subtracting 36 from 39.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 4

Let's proceed to step 4:
The number 4 fits into 39 9 times, leaving a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 1599.0
Subtracting 36 from 39 leaves us with 3.
Take the next digit (3) from the dividend and append it to 3, then repeat: 33 / 4

On to step 5:
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: 15998.0
Subtracting 32 from 33 leaves us with 1.
Append the next digit (3) from the dividend to 1 and continue with: 13 / 4

Step 6:
4 goes into 13 3 times with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 159983.0
Subtracting 12 from 13 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
10 divided by 4 is 2 with a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 159983.2
Deduct 8 from 10 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 8:
When dividing 20 by 4, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 159983.25
If we subtract 20 from 20, 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.

Moving on to step 9:
4 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 159983.25
Subtracting 0 from 0 leaves us 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 10:
4 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 159983.25
If we take 0 away from 0, 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.

After the division, we end up with 159983.25 and a remainder of 0.0.