991408 ÷ 91 
Our goal is to divide 991408 by 91.

Step 1:
The number 91 fits into 9 0 times, leaving a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 91

On to step 2:
91 goes into 99 1 times with a remainder of 8.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 8 after subtracting 91 from 99.
Bring next digit (1) of the dividend behind the 8 and repeat the process: 81 / 91

Moving on to step 3:
If we divide 81 by 91, we get 0 and a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 10.0
Subtract 0 from 81 to get 81.
Include the next digit (4) from the dividend after 81, then repeat: 814 / 91

Moving on to step 4:
When dividing 814 by 91, we get 8 with a remainder of 86.
The next digit of our result is 8. 
Result so far: 108.0
Subtracting 728 from 814 leaves us with 86.
Bring next digit (0) of the dividend behind the 86 and repeat the process: 860 / 91

On to step 5:
When dividing 860 by 91, we get 9 with a remainder of 41.
Record the quotient 9 as the next digit in the result. 
Result so far: 1089.0
Deduct 819 from 860 and we're left with 41.
Take the next digit (8) from the dividend and append it to 41, then repeat: 418 / 91

Step 6:
418 divided by 91 is 4 with a remainder of 54.
Use 4 as the next digit of our solution. 
Result so far: 10894.0
Deduct 364 from 418 and we're left with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 7:
When dividing 540 by 91, we get 5 with a remainder of 85.
Use 5 as the next digit of our solution. 
Result so far: 10894.5
If we take 455 away from 540, we end up with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Going ahead to step 8:
850 divided by 91 is 9 with a remainder of 31.
Put 9 as the next digit of the answer. 
Result so far: 10894.59
If we take 819 away from 850, 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.

Let's proceed to step 9:
The number 91 fits into 310 3 times, leaving a remainder of 37.
Record the quotient 3 as the next digit in the result. 
Result so far: 10894.593
The remainder is 37 after subtracting 273 from 310.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Advancing to step 10:
91 goes into 370 4 times with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 10894.5934
Deduct 364 from 370 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 11:
91 can be fit into 60 0 times, resulting in a remainder of 60.
Record the quotient 0 as the next digit in the result. 
Result so far: 10894.5934
The remainder is 60 after subtracting 0 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Advancing to step 12:
The number 91 fits into 600 6 times, leaving a remainder of 54.
Record the quotient 6 as the next digit in the result. 
Result so far: 10894.593406
If we take 546 away from 600, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Moving on to step 13:
540 divided by 91 is 5 with a remainder of 85.
The next digit of our result is 5. 
Result so far: 10894.5934065
If we take 455 away from 540, we end up with 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Going ahead to step 14:
91 can be fit into 850 9 times, resulting in a remainder of 31.
The next digit of our result is 9. 
Result so far: 10894.59340659
If we subtract 819 from 850, 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.

The final result is 10894.59340659 with a remainder of 3.1e-08.