86661274 ÷ 81 
We want to divide 86661274 by 81.

Going ahead to step 1:
The number 81 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Include the next digit (6) from the dividend after 8, then repeat: 86 / 81

Moving on to step 2:
If we divide 86 by 81, we get 1 and a remainder of 5.
The next digit of our result is 1. 
Result so far: 1.0
If we subtract 81 from 86, we get 5.
Take the next digit (6) from the dividend and append it to 5, then repeat: 56 / 81

Moving on to step 3:
56 divided by 81 is 0 with a remainder of 56.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 56, we get 56.
Append the next digit (6) from the dividend to 56 and continue with: 566 / 81

Moving on to step 4:
81 goes into 566 6 times with a remainder of 80.
Use 6 as the next digit of our solution. 
Result so far: 106.0
If we take 486 away from 566, we end up with 80.
Append the next digit (1) from the dividend to 80 and continue with: 801 / 81

Let's proceed to step 5:
801 divided by 81 is 9 with a remainder of 72.
Record the quotient 9 as the next digit in the result. 
Result so far: 1069.0
If we take 729 away from 801, we end up with 72.
Bring next digit (2) of the dividend behind the 72 and repeat the process: 722 / 81

Advancing to step 6:
If we divide 722 by 81, we get 8 and a remainder of 74.
The number 8 becomes the next digit in our result. 
Result so far: 10698.0
Deduct 648 from 722 and we're left with 74.
Append the next digit (7) from the dividend to 74 and continue with: 747 / 81

Step 7:
If we divide 747 by 81, we get 9 and a remainder of 18.
Put 9 as the next digit of the answer. 
Result so far: 106989.0
The remainder is 18 after subtracting 729 from 747.
Fetch the next digit (4) from the dividend, attach it to 18 and continue: 184 / 81

Advancing to step 8:
If we divide 184 by 81, we get 2 and a remainder of 22.
Put 2 as the next digit of the answer. 
Result so far: 1069892.0
Subtract 162 from 184 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.

Step 9:
When dividing 220 by 81, we get 2 with a remainder of 58.
Use 2 as the next digit of our solution. 
Result so far: 1069892.2
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 10:
The number 81 fits into 580 7 times, leaving a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 1069892.27
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.

Advancing to step 11:
81 can be fit into 130 1 times, resulting in a remainder of 49.
Record the quotient 1 as the next digit in the result. 
Result so far: 1069892.271
Subtracting 81 from 130 leaves us with 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 12:
The number 81 fits into 490 6 times, leaving a remainder of 4.
The next digit of our result is 6. 
Result so far: 1069892.2716
Subtracting 486 from 490 leaves us 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.

Advancing to step 13:
81 goes into 40 0 times with a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 1069892.2716
Subtracting 0 from 40 leaves us 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.

Moving on to step 14:
400 divided by 81 is 4 with a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 1069892.271604
Subtracting 324 from 400 leaves us 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 15:
760 divided by 81 is 9 with a remainder of 31.
Record the quotient 9 as the next digit in the result. 
Result so far: 1069892.2716049
If we subtract 729 from 760, we get 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 16:
310 divided by 81 is 3 with a remainder of 67.
Put 3 as the next digit of the answer. 
Result so far: 1069892.27160493
If we take 243 away from 310, we end up 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.

In conclusion, the division gives 1069892.27160493 with a balance of 6.7e-08.