399541 ÷ 81 
We want to divide 399541 by 81.

Going ahead to step 1:
81 can be fit into 3 0 times, resulting in a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 81

Step 2:
When dividing 39 by 81, we get 0 with a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 39, we end up with 39.
Append the next digit (9) from the dividend to 39 and continue with: 399 / 81

Step 3:
81 can be fit into 399 4 times, resulting in a remainder of 75.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 324 away from 399, we end up with 75.
Append the next digit (5) from the dividend to 75 and continue with: 755 / 81

Let's proceed to step 4:
If we divide 755 by 81, we get 9 and a remainder of 26.
Use 9 as the next digit of our solution. 
Result so far: 49.0
Deduct 729 from 755 and we're left with 26.
Take the next digit (4) from the dividend and append it to 26, then repeat: 264 / 81

Moving on to step 5:
If we divide 264 by 81, we get 3 and a remainder of 21.
The next digit of our result is 3. 
Result so far: 493.0
If we subtract 243 from 264, we get 21.
Include the next digit (1) from the dividend after 21, then repeat: 211 / 81

On to step 6:
If we divide 211 by 81, we get 2 and a remainder of 49.
Record the quotient 2 as the next digit in the result. 
Result so far: 4932.0
The remainder is 49 after subtracting 162 from 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Let's proceed to step 7:
81 goes into 490 6 times with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 4932.6
If we subtract 486 from 490, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 8:
The number 81 fits into 40 0 times, leaving a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 4932.6
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 9:
81 can be fit into 400 4 times, resulting in a remainder of 76.
Use 4 as the next digit of our solution. 
Result so far: 4932.604
If we take 324 away from 400, we end up with 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Step 10:
760 divided by 81 is 9 with a remainder of 31.
Record the quotient 9 as the next digit in the result. 
Result so far: 4932.6049
The remainder is 31 after subtracting 729 from 760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Step 11:
If we divide 310 by 81, we get 3 and a remainder of 67.
Use 3 as the next digit of our solution. 
Result so far: 4932.60493
If we subtract 243 from 310, we get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Step 12:
The number 81 fits into 670 8 times, leaving a remainder of 22.
Use 8 as the next digit of our solution. 
Result so far: 4932.604938
Deduct 648 from 670 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 13:
The number 81 fits into 220 2 times, leaving a remainder of 58.
The number 2 becomes the next digit in our result. 
Result so far: 4932.6049382
Deduct 162 from 220 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 14:
580 divided by 81 is 7 with a remainder of 13.
Record the quotient 7 as the next digit in the result. 
Result so far: 4932.60493827
If we take 567 away from 580, we end up with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final outcome is 4932.60493827, with a leftover of 1.3e-08.