We look at the division of 86509816 by 91 
Our goal is to divide 86509816 by 91.

Let's proceed to step 1:
The number 91 fits into 8 0 times, leaving a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Bring next digit (6) of the dividend behind the 8 and repeat the process: 86 / 91

On to step 2:
The number 91 fits into 86 0 times, leaving a remainder of 86.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Fetch the next digit (5) from the dividend, attach it to 86 and continue: 865 / 91

Advancing to step 3:
When dividing 865 by 91, we get 9 with a remainder of 46.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtracting 819 from 865 leaves us with 46.
Fetch the next digit (0) from the dividend, attach it to 46 and continue: 460 / 91

Moving on to step 4:
460 divided by 91 is 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 95.0
Subtract 455 from 460 to get 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 91

On to step 5:
59 divided by 91 is 0 with a remainder of 59.
Put 0 as the next digit of the answer. 
Result so far: 950.0
The remainder is 59 after subtracting 0 from 59.
Bring next digit (8) of the dividend behind the 59 and repeat the process: 598 / 91

Advancing to step 6:
When dividing 598 by 91, we get 6 with a remainder of 52.
Write down 6 as next digit of the result. 
Result so far: 9506.0
If we take 546 away from 598, we end up with 52.
Fetch the next digit (1) from the dividend, attach it to 52 and continue: 521 / 91

Going ahead to step 7:
91 can be fit into 521 5 times, resulting in a remainder of 66.
Put 5 as the next digit of the answer. 
Result so far: 95065.0
If we take 455 away from 521, we end up with 66.
Include the next digit (6) from the dividend after 66, then repeat: 666 / 91

Going ahead to step 8:
If we divide 666 by 91, we get 7 and a remainder of 29.
Record the quotient 7 as the next digit in the result. 
Result so far: 950657.0
Subtract 637 from 666 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Moving on to step 9:
91 can be fit into 290 3 times, resulting in a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 950657.3
If we subtract 273 from 290, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 10:
When dividing 170 by 91, we get 1 with a remainder of 79.
Use 1 as the next digit of our solution. 
Result so far: 950657.31
Subtract 91 from 170 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 11:
91 goes into 790 8 times with a remainder of 62.
The next digit of our result is 8. 
Result so far: 950657.318
If we take 728 away from 790, we end up with 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Going ahead to step 12:
The number 91 fits into 620 6 times, leaving a remainder of 74.
Use 6 as the next digit of our solution. 
Result so far: 950657.3186
Subtract 546 from 620 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Step 13:
The number 91 fits into 740 8 times, leaving a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 950657.31868
The remainder is 12 after subtracting 728 from 740.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 14:
91 goes into 120 1 times with a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 950657.318681
Subtract 91 from 120 to get 29.
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 15:
91 can be fit into 290 3 times, resulting in a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 950657.3186813
If we take 273 away from 290, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 16:
If we divide 170 by 91, we get 1 and a remainder of 79.
Put 1 as the next digit of the answer. 
Result so far: 950657.31868131
The remainder is 79 after subtracting 91 from 170.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

The final result is 950657.31868131 with a remainder of 7.9e-08.