We divide 639260 by 81
Our goal is to divide 639260 by 81.

On to step 1:
When dividing 6 by 81, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Take the next digit (3) from the dividend and append it to 6, then repeat: 63 / 81

Advancing to step 2:
If we divide 63 by 81, we get 0 and a remainder of 63.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 63, we get 63.
Grab the next digit (9) from the dividend, add it to 63, then carry on: 639 / 81

Going ahead to step 3:
81 can be fit into 639 7 times, resulting in a remainder of 72.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtracting 567 from 639 leaves us with 72.
Append the next digit (2) from the dividend to 72 and continue with: 722 / 81

On to step 4:
722 divided by 81 is 8 with a remainder of 74.
Use 8 as the next digit of our solution. 
Result so far: 78.0
Deduct 648 from 722 and we're left with 74.
Fetch the next digit (6) from the dividend, attach it to 74 and continue: 746 / 81

Moving on to step 5:
81 can be fit into 746 9 times, resulting in a remainder of 17.
The number 9 becomes the next digit in our result. 
Result so far: 789.0
Deduct 729 from 746 and we're left with 17.
Take the next digit (0) from the dividend and append it to 17, then repeat: 170 / 81

On to step 6:
When dividing 170 by 81, we get 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 7892.0
Subtract 162 from 170 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 7:
If we divide 80 by 81, we get 0 and a remainder of 80.
Use 0 as the next digit of our solution. 
Result so far: 7892.0
The remainder is 80 after subtracting 0 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 8:
If we divide 800 by 81, we get 9 and a remainder of 71.
The next digit of our result is 9. 
Result so far: 7892.09
Subtract 729 from 800 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Let's proceed to step 9:
81 goes into 710 8 times with a remainder of 62.
Use 8 as the next digit of our solution. 
Result so far: 7892.098
If we take 648 away from 710, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Advancing to step 10:
620 divided by 81 is 7 with a remainder of 53.
Record the quotient 7 as the next digit in the result. 
Result so far: 7892.0987
Subtract 567 from 620 to get 53.
Since there are no more digits in the dividend, we add a zero to the remainder making it 530, and continue the process.

Advancing to step 11:
If we divide 530 by 81, we get 6 and a remainder of 44.
The number 6 becomes the next digit in our result. 
Result so far: 7892.09876
Deduct 486 from 530 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

On to step 12:
81 can be fit into 440 5 times, resulting in a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 7892.098765
If we take 405 away from 440, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 13:
If we divide 350 by 81, we get 4 and a remainder of 26.
The number 4 becomes the next digit in our result. 
Result so far: 7892.0987654
The remainder is 26 after subtracting 324 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Let's proceed to step 14:
The number 81 fits into 260 3 times, leaving a remainder of 17.
Write down 3 as next digit of the result. 
Result so far: 7892.09876543
If we take 243 away from 260, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

The final result is 7892.09876543 with a remainder of 1.7e-08.