Let's divide 664369 by 81
Our goal is to divide 664369 by 81.

Step 1:
If we divide 6 by 81, we get 0 and a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 81

Going ahead to step 2:
When dividing 66 by 81, we get 0 with 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.
Append the next digit (4) from the dividend to 66 and continue with: 664 / 81

Let's proceed to step 3:
The number 81 fits into 664 8 times, leaving a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 648 from 664 and we're left with 16.
Fetch the next digit (3) from the dividend, attach it to 16 and continue: 163 / 81

Going ahead to step 4:
81 can be fit into 163 2 times, resulting in a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 82.0
If we take 162 away from 163, we end up with 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 81

Let's proceed to step 5:
81 goes into 16 0 times with a remainder of 16.
Write down 0 as next digit of the result. 
Result so far: 820.0
Subtracting 0 from 16 leaves us with 16.
Include the next digit (9) from the dividend after 16, then repeat: 169 / 81

Step 6:
81 goes into 169 2 times with a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 8202.0
Deduct 162 from 169 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
If we divide 70 by 81, we get 0 and a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 8202.0
Subtracting 0 from 70 leaves us with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 8:
700 divided by 81 is 8 with a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 8202.08
If we take 648 away from 700, we end up with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 9:
520 divided by 81 is 6 with a remainder of 34.
The number 6 becomes the next digit in our result. 
Result so far: 8202.086
If we subtract 486 from 520, we get 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Advancing to step 10:
The number 81 fits into 340 4 times, leaving a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 8202.0864
Deduct 324 from 340 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 11:
81 can be fit into 160 1 times, resulting in a remainder of 79.
Write down 1 as next digit of the result. 
Result so far: 8202.08641
Subtract 81 from 160 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 12:
The number 81 fits into 790 9 times, leaving a remainder of 61.
Use 9 as the next digit of our solution. 
Result so far: 8202.086419
If we subtract 729 from 790, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Moving on to step 13:
If we divide 610 by 81, we get 7 and a remainder of 43.
Put 7 as the next digit of the answer. 
Result so far: 8202.0864197
Deduct 567 from 610 and we're left with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

On to step 14:
430 divided by 81 is 5 with a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 8202.08641975
Deduct 405 from 430 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final result is 8202.08641975 with a remainder of 2.5e-08.