66931 ÷ 81 
We want to figure out the number of times 66931 can be divided by 81.

Step 1:
The number 81 fits into 6 0 times, leaving a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (6) from the dividend to 6 and continue with: 66 / 81

Step 2:
81 goes into 66 0 times with a remainder of 66.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 66, we end up with 66.
Include the next digit (9) from the dividend after 66, then repeat: 669 / 81

Advancing to step 3:
The number 81 fits into 669 8 times, leaving a remainder of 21.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we subtract 648 from 669, we get 21.
Include the next digit (3) from the dividend after 21, then repeat: 213 / 81

On to step 4:
If we divide 213 by 81, we get 2 and a remainder of 51.
Put 2 as the next digit of the answer. 
Result so far: 82.0
The remainder is 51 after subtracting 162 from 213.
Append the next digit (1) from the dividend to 51 and continue with: 511 / 81

Step 5:
The number 81 fits into 511 6 times, leaving a remainder of 25.
The next digit of our result is 6. 
Result so far: 826.0
If we subtract 486 from 511, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Moving on to step 6:
If we divide 250 by 81, we get 3 and a remainder of 7.
The number 3 becomes the next digit in our result. 
Result so far: 826.3
The remainder is 7 after subtracting 243 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Going ahead to step 7:
The number 81 fits into 70 0 times, leaving a remainder of 70.
The number 0 becomes the next digit in our result. 
Result so far: 826.3
Deduct 0 from 70 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 8:
81 can be fit into 700 8 times, resulting in a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 826.308
Deduct 648 from 700 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 9:
520 divided by 81 is 6 with a remainder of 34.
Use 6 as the next digit of our solution. 
Result so far: 826.3086
Subtracting 486 from 520 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

Moving on to step 10:
If we divide 340 by 81, we get 4 and a remainder of 16.
Use 4 as the next digit of our solution. 
Result so far: 826.30864
Subtract 324 from 340 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 11:
81 can be fit into 160 1 times, resulting in a remainder of 79.
Use 1 as the next digit of our solution. 
Result so far: 826.308641
Subtract 81 from 160 to get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Let's proceed to step 12:
The number 81 fits into 790 9 times, leaving a remainder of 61.
The next digit of our result is 9. 
Result so far: 826.3086419
Deduct 729 from 790 and we're left with 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Step 13:
610 divided by 81 is 7 with a remainder of 43.
Use 7 as the next digit of our solution. 
Result so far: 826.30864197
Deduct 567 from 610 and we're left with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Our division results in 826.30864197 with a remaining 4.3e-08.