91373697 ÷ 80 
We want to figure out the number of times 91373697 can be divided by 80.

Let's proceed to step 1:
When dividing 9 by 80, we get 0 with 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.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 80

Going ahead to step 2:
80 goes into 91 1 times with a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 80 from 91, we get 11.
Fetch the next digit (3) from the dividend, attach it to 11 and continue: 113 / 80

Moving on to step 3:
The number 80 fits into 113 1 times, leaving a remainder of 33.
Use 1 as the next digit of our solution. 
Result so far: 11.0
If we take 80 away from 113, we end up with 33.
Take the next digit (7) from the dividend and append it to 33, then repeat: 337 / 80

Step 4:
80 goes into 337 4 times with a remainder of 17.
Write down 4 as next digit of the result. 
Result so far: 114.0
Subtracting 320 from 337 leaves us with 17.
Take the next digit (3) from the dividend and append it to 17, then repeat: 173 / 80

Moving on to step 5:
When dividing 173 by 80, we get 2 with a remainder of 13.
Put 2 as the next digit of the answer. 
Result so far: 1142.0
The remainder is 13 after subtracting 160 from 173.
Take the next digit (6) from the dividend and append it to 13, then repeat: 136 / 80

Let's proceed to step 6:
If we divide 136 by 80, we get 1 and a remainder of 56.
The number 1 becomes the next digit in our result. 
Result so far: 11421.0
The remainder is 56 after subtracting 80 from 136.
Fetch the next digit (9) from the dividend, attach it to 56 and continue: 569 / 80

Advancing to step 7:
569 divided by 80 is 7 with a remainder of 9.
Record the quotient 7 as the next digit in the result. 
Result so far: 114217.0
Deduct 560 from 569 and we're left with 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 80

On to step 8:
97 divided by 80 is 1 with a remainder of 17.
Use 1 as the next digit of our solution. 
Result so far: 1142171.0
If we take 80 away from 97, 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.

On to step 9:
80 goes into 170 2 times with a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 1142171.2
Subtracting 160 from 170 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
If we divide 100 by 80, we get 1 and a remainder of 20.
Use 1 as the next digit of our solution. 
Result so far: 1142171.21
Deduct 80 from 100 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 11:
The number 80 fits into 200 2 times, leaving a remainder of 40.
Use 2 as the next digit of our solution. 
Result so far: 1142171.212
Deduct 160 from 200 and we're left 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.

Moving on to step 12:
The number 80 fits into 400 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 1142171.2125
The remainder is 0 after subtracting 400 from 400.
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:
When dividing 0 by 80, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 1142171.2125
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.

Step 14:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 1142171.2125
Subtracting 0 from 0 leaves us 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.

The final result is 1142171.2125 with a remainder of 0.0.