806821 ÷ 66 
Our goal is to divide 806821 by 66.

Step 1:
The number 66 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 66

On to step 2:
66 goes into 80 1 times with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 1.0
If we take 66 away from 80, we end up with 14.
Include the next digit (6) from the dividend after 14, then repeat: 146 / 66

Going ahead to step 3:
When dividing 146 by 66, we get 2 with a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we take 132 away from 146, we end up with 14.
Fetch the next digit (8) from the dividend, attach it to 14 and continue: 148 / 66

On to step 4:
The number 66 fits into 148 2 times, leaving a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 122.0
Deduct 132 from 148 and we're left with 16.
Bring next digit (2) of the dividend behind the 16 and repeat the process: 162 / 66

Step 5:
66 goes into 162 2 times with a remainder of 30.
Write down 2 as next digit of the result. 
Result so far: 1222.0
If we subtract 132 from 162, we get 30.
Take the next digit (1) from the dividend and append it to 30, then repeat: 301 / 66

On to step 6:
66 goes into 301 4 times with a remainder of 37.
Use 4 as the next digit of our solution. 
Result so far: 12224.0
Subtract 264 from 301 to get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 7:
66 goes into 370 5 times with a remainder of 40.
Put 5 as the next digit of the answer. 
Result so far: 12224.5
Deduct 330 from 370 and we're left 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.

On to step 8:
If we divide 400 by 66, we get 6 and a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 12224.56
If we take 396 away from 400, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 9:
40 divided by 66 is 0 with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 12224.56
Deduct 0 from 40 and we're left 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.

Step 10:
66 goes into 400 6 times with a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 12224.5606
Subtracting 396 from 400 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 11:
66 goes into 40 0 times with a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 12224.5606
The remainder is 40 after subtracting 0 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 12:
The number 66 fits into 400 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 12224.560606
If we subtract 396 from 400, 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.

Going ahead to step 13:
If we divide 40 by 66, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 12224.560606
If we subtract 0 from 40, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 14:
400 divided by 66 is 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 12224.56060606
Deduct 396 from 400 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 12224.56060606, with a leftover of 4e-09.