91163231 ÷ 80 
Let's see how many times 80 fits into 91163231.

On to step 1:
When dividing 9 by 80, we get 0 with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 80

Step 2:
If we divide 91 by 80, we get 1 and a remainder of 11.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 80 from 91 and we're left with 11.
Take the next digit (1) from the dividend and append it to 11, then repeat: 111 / 80

Let's proceed to step 3:
The number 80 fits into 111 1 times, leaving a remainder of 31.
The next digit of our result is 1. 
Result so far: 11.0
Subtracting 80 from 111 leaves us with 31.
Bring next digit (6) of the dividend behind the 31 and repeat the process: 316 / 80

Moving on to step 4:
80 goes into 316 3 times with a remainder of 76.
Record the quotient 3 as the next digit in the result. 
Result so far: 113.0
Deduct 240 from 316 and we're left with 76.
Bring next digit (3) of the dividend behind the 76 and repeat the process: 763 / 80

Advancing to step 5:
80 goes into 763 9 times with a remainder of 43.
Put 9 as the next digit of the answer. 
Result so far: 1139.0
If we subtract 720 from 763, we get 43.
Append the next digit (2) from the dividend to 43 and continue with: 432 / 80

Going ahead to step 6:
If we divide 432 by 80, we get 5 and a remainder of 32.
Put 5 as the next digit of the answer. 
Result so far: 11395.0
Subtract 400 from 432 to get 32.
Take the next digit (3) from the dividend and append it to 32, then repeat: 323 / 80

Going ahead to step 7:
When dividing 323 by 80, we get 4 with a remainder of 3.
The number 4 becomes the next digit in our result. 
Result so far: 113954.0
If we take 320 away from 323, we end up with 3.
Take the next digit (1) from the dividend and append it to 3, then repeat: 31 / 80

Advancing to step 8:
The number 80 fits into 31 0 times, leaving a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 1139540.0
If we subtract 0 from 31, 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.

Advancing to step 9:
80 goes into 310 3 times with a remainder of 70.
The next digit of our result is 3. 
Result so far: 1139540.3
If we subtract 240 from 310, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 10:
700 divided by 80 is 8 with a remainder of 60.
Record the quotient 8 as the next digit in the result. 
Result so far: 1139540.38
If we take 640 away from 700, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 11:
If we divide 600 by 80, we get 7 and a remainder of 40.
The number 7 becomes the next digit in our result. 
Result so far: 1139540.387
If we subtract 560 from 600, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 12:
400 divided by 80 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 1139540.3875
If we take 400 away from 400, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 13:
0 divided by 80 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1139540.3875
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 14:
0 divided by 80 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1139540.3875
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 1139540.3875, and the remainder is 0.0.