840816 divided by 81 
Our goal is to divide 840816 by 81.

On to step 1:
When dividing 8 by 81, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (4) of the dividend behind the 8 and repeat the process: 84 / 81

Let's proceed to step 2:
81 goes into 84 1 times with a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 3 after subtracting 81 from 84.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 81

Step 3:
The number 81 fits into 30 0 times, leaving a remainder of 30.
Write down 0 as next digit of the result. 
Result so far: 10.0
The remainder is 30 after subtracting 0 from 30.
Take the next digit (8) from the dividend and append it to 30, then repeat: 308 / 81

Advancing to step 4:
The number 81 fits into 308 3 times, leaving a remainder of 65.
Record the quotient 3 as the next digit in the result. 
Result so far: 103.0
Deduct 243 from 308 and we're left with 65.
Include the next digit (1) from the dividend after 65, then repeat: 651 / 81

Step 5:
81 can be fit into 651 8 times, resulting in a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 1038.0
Subtracting 648 from 651 leaves us with 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 81

Going ahead to step 6:
81 can be fit into 36 0 times, resulting in a remainder of 36.
Write down 0 as next digit of the result. 
Result so far: 10380.0
Subtracting 0 from 36 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 7:
81 goes into 360 4 times with a remainder of 36.
Record the quotient 4 as the next digit in the result. 
Result so far: 10380.4
Subtract 324 from 360 to get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 8:
If we divide 360 by 81, we get 4 and a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 10380.44
Subtracting 324 from 360 leaves us with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final outcome is 10380.44, with a leftover of 0.036.