We look at the division of 66409961 by 811 
Let's see how many times 811 fits into 66409961.

Step 1:
811 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 811

Advancing to step 2:
When dividing 66 by 811, we get 0 with a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 66 and we're left with 66.
Append the next digit (4) from the dividend to 66 and continue with: 664 / 811

On to step 3:
811 goes into 664 0 times with a remainder of 664.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 664, we end up with 664.
Fetch the next digit (0) from the dividend, attach it to 664 and continue: 6640 / 811

Step 4:
The number 811 fits into 6640 8 times, leaving a remainder of 152.
Write down 8 as next digit of the result. 
Result so far: 8.0
The remainder is 152 after subtracting 6488 from 6640.
Bring next digit (9) of the dividend behind the 152 and repeat the process: 1529 / 811

Going ahead to step 5:
If we divide 1529 by 811, we get 1 and a remainder of 718.
Write down 1 as next digit of the result. 
Result so far: 81.0
If we take 811 away from 1529, we end up with 718.
Take the next digit (9) from the dividend and append it to 718, then repeat: 7189 / 811

On to step 6:
The number 811 fits into 7189 8 times, leaving a remainder of 701.
Put 8 as the next digit of the answer. 
Result so far: 818.0
Subtract 6488 from 7189 to get 701.
Fetch the next digit (6) from the dividend, attach it to 701 and continue: 7016 / 811

Moving on to step 7:
811 goes into 7016 8 times with a remainder of 528.
Write down 8 as next digit of the result. 
Result so far: 8188.0
If we subtract 6488 from 7016, we get 528.
Take the next digit (1) from the dividend and append it to 528, then repeat: 5281 / 811

Let's proceed to step 8:
811 can be fit into 5281 6 times, resulting in a remainder of 415.
Record the quotient 6 as the next digit in the result. 
Result so far: 81886.0
The remainder is 415 after subtracting 4866 from 5281.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

Advancing to step 9:
If we divide 4150 by 811, we get 5 and a remainder of 95.
The next digit of our result is 5. 
Result so far: 81886.5
If we take 4055 away from 4150, we end up with 95.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Let's proceed to step 10:
811 goes into 950 1 times with a remainder of 139.
Record the quotient 1 as the next digit in the result. 
Result so far: 81886.51
Subtract 811 from 950 to get 139.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1390, and continue the process.

Moving on to step 11:
When dividing 1390 by 811, we get 1 with a remainder of 579.
Put 1 as the next digit of the answer. 
Result so far: 81886.511
If we subtract 811 from 1390, we get 579.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5790, and continue the process.

Our division results in 81886.511 with a remaining 0.0579.