We divide 638581 by 81
We want to figure out the number of times 638581 can be divided by 81.

Step 1:
81 can be fit into 6 0 times, resulting in a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Include the next digit (3) from the dividend after 6, then repeat: 63 / 81

On to step 2:
81 can be fit into 63 0 times, resulting in a remainder of 63.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 63 after subtracting 0 from 63.
Append the next digit (8) from the dividend to 63 and continue with: 638 / 81

On to step 3:
When dividing 638 by 81, we get 7 with a remainder of 71.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
Subtracting 567 from 638 leaves us with 71.
Grab the next digit (5) from the dividend, add it to 71, then carry on: 715 / 81

Going ahead to step 4:
If we divide 715 by 81, we get 8 and a remainder of 67.
Use 8 as the next digit of our solution. 
Result so far: 78.0
Subtracting 648 from 715 leaves us with 67.
Include the next digit (8) from the dividend after 67, then repeat: 678 / 81

Going ahead to step 5:
If we divide 678 by 81, we get 8 and a remainder of 30.
Put 8 as the next digit of the answer. 
Result so far: 788.0
Deduct 648 from 678 and we're left with 30.
Grab the next digit (1) from the dividend, add it to 30, then carry on: 301 / 81

Advancing to step 6:
The number 81 fits into 301 3 times, leaving a remainder of 58.
Record the quotient 3 as the next digit in the result. 
Result so far: 7883.0
If we subtract 243 from 301, we get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 7:
If we divide 580 by 81, we get 7 and a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 7883.7
If we subtract 567 from 580, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 8:
81 can be fit into 130 1 times, resulting in a remainder of 49.
The number 1 becomes the next digit in our result. 
Result so far: 7883.71
Deduct 81 from 130 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Advancing to step 9:
The number 81 fits into 490 6 times, leaving a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 7883.716
If we take 486 away from 490, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 10:
81 can be fit into 40 0 times, resulting in a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 7883.716
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 11:
400 divided by 81 is 4 with a remainder of 76.
Record the quotient 4 as the next digit in the result. 
Result so far: 7883.71604
The remainder is 76 after subtracting 324 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 12:
81 goes into 760 9 times with a remainder of 31.
The next digit of our result is 9. 
Result so far: 7883.716049
Deduct 729 from 760 and we're left with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 13:
81 goes into 310 3 times with a remainder of 67.
Use 3 as the next digit of our solution. 
Result so far: 7883.7160493
The remainder is 67 after subtracting 243 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Moving on to step 14:
The number 81 fits into 670 8 times, leaving a remainder of 22.
Put 8 as the next digit of the answer. 
Result so far: 7883.71604938
Subtract 648 from 670 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

The final result is 7883.71604938 with a remainder of 2.2e-08.