939991 divided by 81 
We want to figure out the number of times 939991 can be divided by 81.

Step 1:
When dividing 9 by 81, we get 0 with a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Take the next digit (3) from the dividend and append it to 9, then repeat: 93 / 81

Going ahead to step 2:
81 can be fit into 93 1 times, resulting in a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 81 from 93 to get 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 81

Advancing to step 3:
When dividing 129 by 81, we get 1 with a remainder of 48.
Record the quotient 1 as the next digit in the result. 
Result so far: 11.0
Subtract 81 from 129 to get 48.
Append the next digit (9) from the dividend to 48 and continue with: 489 / 81

Step 4:
81 can be fit into 489 6 times, resulting in a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 116.0
Deduct 486 from 489 and we're left with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 81

Advancing to step 5:
The number 81 fits into 39 0 times, leaving a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 1160.0
If we take 0 away from 39, we end up with 39.
Append the next digit (1) from the dividend to 39 and continue with: 391 / 81

Advancing to step 6:
81 can be fit into 391 4 times, resulting in a remainder of 67.
Write down 4 as next digit of the result. 
Result so far: 11604.0
Subtracting 324 from 391 leaves us with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Going ahead to step 7:
670 divided by 81 is 8 with a remainder of 22.
Put 8 as the next digit of the answer. 
Result so far: 11604.8
Subtract 648 from 670 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 8:
If we divide 220 by 81, we get 2 and a remainder of 58.
The number 2 becomes the next digit in our result. 
Result so far: 11604.82
If we take 162 away from 220, we end up 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.

Going ahead to step 9:
580 divided by 81 is 7 with a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 11604.827
If we subtract 567 from 580, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 10:
81 can be fit into 130 1 times, resulting in a remainder of 49.
Put 1 as the next digit of the answer. 
Result so far: 11604.8271
Subtract 81 from 130 to get 49.
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 11:
81 goes into 490 6 times with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 11604.82716
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.

Step 12:
81 goes into 40 0 times with a remainder of 40.
The next digit of our result is 0. 
Result so far: 11604.82716
If we take 0 away from 40, we end up 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.

Let's proceed to step 13:
400 divided by 81 is 4 with a remainder of 76.
Record the quotient 4 as the next digit in the result. 
Result so far: 11604.8271604
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.

Let's proceed to step 14:
The number 81 fits into 760 9 times, leaving a remainder of 31.
Use 9 as the next digit of our solution. 
Result so far: 11604.82716049
Subtracting 729 from 760 leaves us with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

After the division, we end up with 11604.82716049 and a remainder of 3.1e-08.