6639 divided by 10 
Let's see how many times 10 fits into 6639.

Step 1:
The number 10 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 10

Step 2:
The number 10 fits into 66 6 times, leaving a remainder of 6.
Use 6 as the next digit of our solution. 
Result so far: 6.0
The remainder is 6 after subtracting 60 from 66.
Append the next digit (3) from the dividend to 6 and continue with: 63 / 10

Going ahead to step 3:
10 can be fit into 63 6 times, resulting in a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 66.0
If we subtract 60 from 63, we get 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 10

Step 4:
39 divided by 10 is 3 with a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 663.0
If we take 30 away from 39, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 5:
If we divide 90 by 10, we get 9 and a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 663.9
If we subtract 90 from 90, 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.

On to step 6:
10 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 663.9
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.

Let's proceed to step 7:
When dividing 0 by 10, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 663.9
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.

Our division results in 663.9 with a remaining 0.0.