639863 ÷ 10 
We want to divide 639863 by 10.

Advancing to step 1:
If we divide 6 by 10, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (3) of the dividend behind the 6 and repeat the process: 63 / 10

Moving on to step 2:
If we divide 63 by 10, we get 6 and a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 6.0
Subtracting 60 from 63 leaves us with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 10

Step 3:
When dividing 39 by 10, we get 3 with a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 63.0
If we subtract 30 from 39, we get 9.
Fetch the next digit (8) from the dividend, attach it to 9 and continue: 98 / 10

Moving on to step 4:
The number 10 fits into 98 9 times, leaving a remainder of 8.
The next digit of our result is 9. 
Result so far: 639.0
The remainder is 8 after subtracting 90 from 98.
Append the next digit (6) from the dividend to 8 and continue with: 86 / 10

Going ahead to step 5:
The number 10 fits into 86 8 times, leaving a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 6398.0
Subtract 80 from 86 to get 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 10

On to step 6:
63 divided by 10 is 6 with a remainder of 3.
Use 6 as the next digit of our solution. 
Result so far: 63986.0
If we subtract 60 from 63, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 7:
If we divide 30 by 10, we get 3 and a remainder of 0.
Use 3 as the next digit of our solution. 
Result so far: 63986.3
Subtracting 30 from 30 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.

Let's proceed to step 8:
The number 10 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 63986.3
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 9:
10 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: 63986.3
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.

Our division results in 63986.3 with a remaining 0.0.