We divide 91578858 by 80
We want to figure out the number of times 91578858 can be divided by 80.

Let's proceed to 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

Step 2:
80 can be fit into 91 1 times, resulting in a remainder of 11.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 11 after subtracting 80 from 91.
Bring next digit (5) of the dividend behind the 11 and repeat the process: 115 / 80

Advancing to step 3:
115 divided by 80 is 1 with a remainder of 35.
Use 1 as the next digit of our solution. 
Result so far: 11.0
The remainder is 35 after subtracting 80 from 115.
Bring next digit (7) of the dividend behind the 35 and repeat the process: 357 / 80

Step 4:
When dividing 357 by 80, we get 4 with a remainder of 37.
Use 4 as the next digit of our solution. 
Result so far: 114.0
If we subtract 320 from 357, we get 37.
Bring next digit (8) of the dividend behind the 37 and repeat the process: 378 / 80

Going ahead to step 5:
If we divide 378 by 80, we get 4 and a remainder of 58.
Put 4 as the next digit of the answer. 
Result so far: 1144.0
The remainder is 58 after subtracting 320 from 378.
Bring next digit (8) of the dividend behind the 58 and repeat the process: 588 / 80

Let's proceed to step 6:
80 goes into 588 7 times with a remainder of 28.
The next digit of our result is 7. 
Result so far: 11447.0
Subtract 560 from 588 to get 28.
Append the next digit (5) from the dividend to 28 and continue with: 285 / 80

Step 7:
When dividing 285 by 80, we get 3 with a remainder of 45.
Record the quotient 3 as the next digit in the result. 
Result so far: 114473.0
Subtract 240 from 285 to get 45.
Take the next digit (8) from the dividend and append it to 45, then repeat: 458 / 80

Step 8:
458 divided by 80 is 5 with a remainder of 58.
Record the quotient 5 as the next digit in the result. 
Result so far: 1144735.0
Deduct 400 from 458 and we're left with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Let's proceed to step 9:
When dividing 580 by 80, we get 7 with a remainder of 20.
The number 7 becomes the next digit in our result. 
Result so far: 1144735.7
If we take 560 away from 580, we end up 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 10:
200 divided by 80 is 2 with a remainder of 40.
Write down 2 as next digit of the result. 
Result so far: 1144735.72
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.

Going ahead to step 11:
If we divide 400 by 80, we get 5 and a remainder of 0.
The next digit of our result is 5. 
Result so far: 1144735.725
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.

On to step 12:
80 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 1144735.725
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.

Moving on to step 13:
The number 80 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 1144735.725
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.

After the division, we end up with 1144735.725 and a remainder of 0.0.