393120 ÷ 81 
We want to divide 393120 by 81.

Advancing to step 1:
The number 81 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 81

Moving on to step 2:
39 divided by 81 is 0 with a remainder of 39.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Append the next digit (3) from the dividend to 39 and continue with: 393 / 81

On to step 3:
81 can be fit into 393 4 times, resulting in a remainder of 69.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
Subtract 324 from 393 to get 69.
Take the next digit (1) from the dividend and append it to 69, then repeat: 691 / 81

Let's proceed to step 4:
691 divided by 81 is 8 with a remainder of 43.
The next digit of our result is 8. 
Result so far: 48.0
Deduct 648 from 691 and we're left with 43.
Bring next digit (2) of the dividend behind the 43 and repeat the process: 432 / 81

On to step 5:
81 goes into 432 5 times with a remainder of 27.
The number 5 becomes the next digit in our result. 
Result so far: 485.0
If we take 405 away from 432, we end up with 27.
Grab the next digit (0) from the dividend, add it to 27, then carry on: 270 / 81

Advancing to step 6:
The number 81 fits into 270 3 times, leaving a remainder of 27.
Write down 3 as next digit of the result. 
Result so far: 4853.0
Deduct 243 from 270 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Step 7:
81 can be fit into 270 3 times, resulting in a remainder of 27.
Put 3 as the next digit of the answer. 
Result so far: 4853.3
Deduct 243 from 270 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Let's proceed to step 8:
The number 81 fits into 270 3 times, leaving a remainder of 27.
Record the quotient 3 as the next digit in the result. 
Result so far: 4853.33
If we take 243 away from 270, we end up with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

The final result is 4853.33 with a remainder of 0.027.