We divide 664128 by 81
Let's see how many times 81 fits into 664128.

On to step 1:
81 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 81

On to step 2:
81 can be fit into 66 0 times, resulting in a remainder of 66.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 66, we get 66.
Take the next digit (4) from the dividend and append it to 66, then repeat: 664 / 81

Moving on to step 3:
664 divided by 81 is 8 with a remainder of 16.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 648 away from 664, we end up with 16.
Take the next digit (1) from the dividend and append it to 16, then repeat: 161 / 81

Moving on to step 4:
81 can be fit into 161 1 times, resulting in a remainder of 80.
The next digit of our result is 1. 
Result so far: 81.0
Deduct 81 from 161 and we're left with 80.
Bring next digit (2) of the dividend behind the 80 and repeat the process: 802 / 81

Step 5:
The number 81 fits into 802 9 times, leaving a remainder of 73.
Use 9 as the next digit of our solution. 
Result so far: 819.0
If we take 729 away from 802, we end up with 73.
Append the next digit (8) from the dividend to 73 and continue with: 738 / 81

Moving on to step 6:
738 divided by 81 is 9 with a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 8199.0
If we subtract 729 from 738, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 7:
If we divide 90 by 81, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 8199.1
Subtracting 81 from 90 leaves us 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.

Going ahead to step 8:
If we divide 90 by 81, we get 1 and a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 8199.11
If we take 81 away from 90, 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.

Our division results in 8199.11 with a remaining 0.009.