991578 ÷ 91 
We want to figure out the number of times 991578 can be divided by 91.

Step 1:
91 can be fit into 9 0 times, resulting in a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Include the next digit (9) from the dividend after 9, then repeat: 99 / 91

Moving on to step 2:
91 goes into 99 1 times with a remainder of 8.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 8 after subtracting 91 from 99.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 91

Step 3:
91 can be fit into 81 0 times, resulting in a remainder of 81.
The number 0 becomes the next digit in our result. 
Result so far: 10.0
Subtract 0 from 81 to get 81.
Grab the next digit (5) from the dividend, add it to 81, then carry on: 815 / 91

Going ahead to step 4:
If we divide 815 by 91, we get 8 and a remainder of 87.
Put 8 as the next digit of the answer. 
Result so far: 108.0
Deduct 728 from 815 and we're left with 87.
Bring next digit (7) of the dividend behind the 87 and repeat the process: 877 / 91

Going ahead to step 5:
When dividing 877 by 91, we get 9 with a remainder of 58.
Record the quotient 9 as the next digit in the result. 
Result so far: 1089.0
Subtract 819 from 877 to get 58.
Take the next digit (8) from the dividend and append it to 58, then repeat: 588 / 91

Moving on to step 6:
If we divide 588 by 91, we get 6 and a remainder of 42.
Write down 6 as next digit of the result. 
Result so far: 10896.0
If we take 546 away from 588, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

On to step 7:
When dividing 420 by 91, we get 4 with a remainder of 56.
Use 4 as the next digit of our solution. 
Result so far: 10896.4
If we take 364 away from 420, we end up 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.

Moving on to step 8:
91 can be fit into 560 6 times, resulting in a remainder of 14.
The number 6 becomes the next digit in our result. 
Result so far: 10896.46
Subtracting 546 from 560 leaves us with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

On to step 9:
If we divide 140 by 91, we get 1 and a remainder of 49.
Use 1 as the next digit of our solution. 
Result so far: 10896.461
Subtract 91 from 140 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.

Step 10:
91 can be fit into 490 5 times, resulting in a remainder of 35.
Write down 5 as next digit of the result. 
Result so far: 10896.4615
If we subtract 455 from 490, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Moving on to step 11:
91 goes into 350 3 times with a remainder of 77.
Put 3 as the next digit of the answer. 
Result so far: 10896.46153
If we take 273 away from 350, we end up with 77.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

On to step 12:
When dividing 770 by 91, we get 8 with a remainder of 42.
The number 8 becomes the next digit in our result. 
Result so far: 10896.461538
If we take 728 away from 770, we end up with 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Going ahead to step 13:
The number 91 fits into 420 4 times, leaving a remainder of 56.
The next digit of our result is 4. 
Result so far: 10896.4615384
Subtracting 364 from 420 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.

Step 14:
560 divided by 91 is 6 with a remainder of 14.
Record the quotient 6 as the next digit in the result. 
Result so far: 10896.46153846
The remainder is 14 after subtracting 546 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 10896.46153846, with a leftover of 1.4e-08.