81510268 ÷ 81 
We're looking to find how many times 81 goes into 81510268.

Step 1:
81 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (1) from the dividend, add it to 8, then carry on: 81 / 81

On to step 2:
81 divided by 81 is 1 with a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 81 away from 81, we end up with 0.
Take the next digit (5) from the dividend and append it to 0, then repeat: 5 / 81

Step 3:
81 can be fit into 5 0 times, resulting in a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 10.0
If we take 0 away from 5, we end up with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 81

On to step 4:
The number 81 fits into 51 0 times, leaving a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 100.0
Subtract 0 from 51 to get 51.
Include the next digit (0) from the dividend after 51, then repeat: 510 / 81

Step 5:
If we divide 510 by 81, we get 6 and a remainder of 24.
The number 6 becomes the next digit in our result. 
Result so far: 1006.0
If we take 486 away from 510, we end up with 24.
Bring next digit (2) of the dividend behind the 24 and repeat the process: 242 / 81

Advancing to step 6:
81 goes into 242 2 times with a remainder of 80.
The next digit of our result is 2. 
Result so far: 10062.0
Subtracting 162 from 242 leaves us with 80.
Include the next digit (6) from the dividend after 80, then repeat: 806 / 81

Going ahead to step 7:
81 goes into 806 9 times with a remainder of 77.
Put 9 as the next digit of the answer. 
Result so far: 100629.0
Subtracting 729 from 806 leaves us with 77.
Take the next digit (8) from the dividend and append it to 77, then repeat: 778 / 81

Let's proceed to step 8:
81 can be fit into 778 9 times, resulting in a remainder of 49.
Put 9 as the next digit of the answer. 
Result so far: 1006299.0
Subtract 729 from 778 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.

Advancing to step 9:
The number 81 fits into 490 6 times, leaving a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 1006299.6
If we take 486 away from 490, 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 10:
81 can be fit into 40 0 times, resulting in a remainder of 40.
Use 0 as the next digit of our solution. 
Result so far: 1006299.6
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.

Going ahead to step 11:
400 divided by 81 is 4 with a remainder of 76.
The next digit of our result is 4. 
Result so far: 1006299.604
Subtract 324 from 400 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

On to step 12:
The number 81 fits into 760 9 times, leaving a remainder of 31.
The next digit of our result is 9. 
Result so far: 1006299.6049
If we take 729 away from 760, we end up 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.

Going ahead to step 13:
The number 81 fits into 310 3 times, leaving a remainder of 67.
Use 3 as the next digit of our solution. 
Result so far: 1006299.60493
If we subtract 243 from 310, we get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 14:
670 divided by 81 is 8 with a remainder of 22.
Record the quotient 8 as the next digit in the result. 
Result so far: 1006299.604938
Deduct 648 from 670 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 15:
81 can be fit into 220 2 times, resulting in a remainder of 58.
Record the quotient 2 as the next digit in the result. 
Result so far: 1006299.6049382
The remainder is 58 after subtracting 162 from 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Step 16:
81 can be fit into 580 7 times, resulting in a remainder of 13.
Write down 7 as next digit of the result. 
Result so far: 1006299.60493827
The remainder is 13 after subtracting 567 from 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

The final result is 1006299.60493827 with a remainder of 1.3e-08.