673839 divided by 81 
Our goal is to divide 673839 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.
Take the next digit (7) from the dividend and append it to 6, then repeat: 67 / 81

Moving on to step 2:
81 can be fit into 67 0 times, resulting in a remainder of 67.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 67, we end up with 67.
Include the next digit (3) from the dividend after 67, then repeat: 673 / 81

Step 3:
If we divide 673 by 81, we get 8 and a remainder of 25.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 648 away from 673, we end up with 25.
Bring next digit (8) of the dividend behind the 25 and repeat the process: 258 / 81

Going ahead to step 4:
258 divided by 81 is 3 with a remainder of 15.
Write down 3 as next digit of the result. 
Result so far: 83.0
If we take 243 away from 258, we end up with 15.
Include the next digit (3) from the dividend after 15, then repeat: 153 / 81

Moving on to step 5:
153 divided by 81 is 1 with a remainder of 72.
Record the quotient 1 as the next digit in the result. 
Result so far: 831.0
If we subtract 81 from 153, we get 72.
Include the next digit (9) from the dividend after 72, then repeat: 729 / 81

Step 6:
729 divided by 81 is 9 with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 8319.0
Subtract 729 from 729 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 7:
When dividing 0 by 81, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8319.0
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
The number 81 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8319.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 8319.0 with a remainder of 0.0.