We look at the division of 91197857 by 80 
Let's see how many times 80 fits into 91197857.

Step 1:
9 divided by 80 is 0 with a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Fetch the next digit (1) from the dividend, attach it to 9 and continue: 91 / 80

Let's proceed to step 2:
80 goes into 91 1 times with a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 11 after subtracting 80 from 91.
Append the next digit (1) from the dividend to 11 and continue with: 111 / 80

Going ahead to step 3:
80 goes into 111 1 times with a remainder of 31.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Deduct 80 from 111 and we're left with 31.
Append the next digit (9) from the dividend to 31 and continue with: 319 / 80

Going ahead to step 4:
80 goes into 319 3 times with a remainder of 79.
Use 3 as the next digit of our solution. 
Result so far: 113.0
If we take 240 away from 319, we end up with 79.
Bring next digit (7) of the dividend behind the 79 and repeat the process: 797 / 80

Let's proceed to step 5:
When dividing 797 by 80, we get 9 with a remainder of 77.
Use 9 as the next digit of our solution. 
Result so far: 1139.0
Deduct 720 from 797 and we're left with 77.
Bring next digit (8) of the dividend behind the 77 and repeat the process: 778 / 80

Step 6:
778 divided by 80 is 9 with a remainder of 58.
Put 9 as the next digit of the answer. 
Result so far: 11399.0
Subtract 720 from 778 to get 58.
Take the next digit (5) from the dividend and append it to 58, then repeat: 585 / 80

On to step 7:
80 can be fit into 585 7 times, resulting in a remainder of 25.
The next digit of our result is 7. 
Result so far: 113997.0
Subtracting 560 from 585 leaves us with 25.
Append the next digit (7) from the dividend to 25 and continue with: 257 / 80

Moving on to step 8:
80 can be fit into 257 3 times, resulting in a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 1139973.0
If we subtract 240 from 257, 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.

Going ahead to step 9:
If we divide 170 by 80, we get 2 and a remainder of 10.
The next digit of our result is 2. 
Result so far: 1139973.2
Subtract 160 from 170 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 10:
The number 80 fits into 100 1 times, leaving a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 1139973.21
If we subtract 80 from 100, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 11:
If we divide 200 by 80, we get 2 and a remainder of 40.
Record the quotient 2 as the next digit in the result. 
Result so far: 1139973.212
Subtracting 160 from 200 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.

On to step 12:
80 goes into 400 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 1139973.2125
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.

Advancing to step 13:
80 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1139973.2125
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 14:
If we divide 0 by 80, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1139973.2125
Subtract 0 from 0 to 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 final outcome is 1139973.2125, with a leftover of 0.0.