13285109 divided by 81 
We're looking to find how many times 81 goes into 13285109.

Step 1:
81 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 81

Going ahead to step 2:
13 divided by 81 is 0 with a remainder of 13.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 13 to get 13.
Fetch the next digit (2) from the dividend, attach it to 13 and continue: 132 / 81

Step 3:
When dividing 132 by 81, we get 1 with a remainder of 51.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Subtracting 81 from 132 leaves us with 51.
Append the next digit (8) from the dividend to 51 and continue with: 518 / 81

Moving on to step 4:
81 can be fit into 518 6 times, resulting in a remainder of 32.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we subtract 486 from 518, we get 32.
Append the next digit (5) from the dividend to 32 and continue with: 325 / 81

Let's proceed to step 5:
81 can be fit into 325 4 times, resulting in a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 164.0
The remainder is 1 after subtracting 324 from 325.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 81

Let's proceed to step 6:
81 can be fit into 11 0 times, resulting in a remainder of 11.
The next digit of our result is 0. 
Result so far: 1640.0
Subtract 0 from 11 to get 11.
Include the next digit (0) from the dividend after 11, then repeat: 110 / 81

Going ahead to step 7:
When dividing 110 by 81, we get 1 with a remainder of 29.
The number 1 becomes the next digit in our result. 
Result so far: 16401.0
If we subtract 81 from 110, we get 29.
Grab the next digit (9) from the dividend, add it to 29, then carry on: 299 / 81

Step 8:
The number 81 fits into 299 3 times, leaving a remainder of 56.
The next digit of our result is 3. 
Result so far: 164013.0
Subtracting 243 from 299 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Going ahead to step 9:
If we divide 560 by 81, we get 6 and a remainder of 74.
Put 6 as the next digit of the answer. 
Result so far: 164013.6
The remainder is 74 after subtracting 486 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 10:
81 can be fit into 740 9 times, resulting in a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 164013.69
Deduct 729 from 740 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 11:
81 goes into 110 1 times with a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 164013.691
The remainder is 29 after subtracting 81 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

On to step 12:
81 goes into 290 3 times with a remainder of 47.
Record the quotient 3 as the next digit in the result. 
Result so far: 164013.6913
Subtracting 243 from 290 leaves us with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

On to step 13:
81 goes into 470 5 times with a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 164013.69135
Subtracting 405 from 470 leaves us with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Moving on to step 14:
81 goes into 650 8 times with a remainder of 2.
The next digit of our result is 8. 
Result so far: 164013.691358
Deduct 648 from 650 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 15:
The number 81 fits into 20 0 times, leaving a remainder of 20.
Put 0 as the next digit of the answer. 
Result so far: 164013.691358
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 16:
The number 81 fits into 200 2 times, leaving a remainder of 38.
Use 2 as the next digit of our solution. 
Result so far: 164013.69135802
If we take 162 away from 200, we end up with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

The final result is 164013.69135802 with a remainder of 3.8e-08.