Let's divide 663139 by 81
Let's see how many times 81 fits into 663139.

Let's proceed to step 1:
6 divided by 81 is 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 81

Let's proceed to step 2:
The number 81 fits into 66 0 times, leaving a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Append the next digit (3) from the dividend to 66 and continue with: 663 / 81

On to step 3:
When dividing 663 by 81, we get 8 with a remainder of 15.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtract 648 from 663 to get 15.
Append the next digit (1) from the dividend to 15 and continue with: 151 / 81

Going ahead to step 4:
81 goes into 151 1 times with a remainder of 70.
Record the quotient 1 as the next digit in the result. 
Result so far: 81.0
Subtract 81 from 151 to get 70.
Include the next digit (3) from the dividend after 70, then repeat: 703 / 81

Step 5:
81 goes into 703 8 times with a remainder of 55.
The number 8 becomes the next digit in our result. 
Result so far: 818.0
The remainder is 55 after subtracting 648 from 703.
Bring next digit (9) of the dividend behind the 55 and repeat the process: 559 / 81

Advancing to step 6:
81 can be fit into 559 6 times, resulting in a remainder of 73.
The number 6 becomes the next digit in our result. 
Result so far: 8186.0
If we take 486 away from 559, we end up with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Going ahead to step 7:
When dividing 730 by 81, we get 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 8186.9
Subtracting 729 from 730 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.

Moving on to step 8:
If we divide 10 by 81, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 8186.9
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 9:
When dividing 100 by 81, we get 1 with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 8186.901
Subtract 81 from 100 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Going ahead to step 10:
The number 81 fits into 190 2 times, leaving a remainder of 28.
The number 2 becomes the next digit in our result. 
Result so far: 8186.9012
If we subtract 162 from 190, we get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 11:
81 can be fit into 280 3 times, resulting in a remainder of 37.
Write down 3 as next digit of the result. 
Result so far: 8186.90123
If we take 243 away from 280, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Step 12:
81 goes into 370 4 times with a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 8186.901234
Subtracting 324 from 370 leaves us with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Step 13:
81 goes into 460 5 times with a remainder of 55.
The next digit of our result is 5. 
Result so far: 8186.9012345
Deduct 405 from 460 and we're left with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Step 14:
81 can be fit into 550 6 times, resulting in a remainder of 64.
Put 6 as the next digit of the answer. 
Result so far: 8186.90123456
Subtract 486 from 550 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

The final result is 8186.90123456 with a remainder of 6.4e-08.