80007080 ÷ 91 
We want to figure out the number of times 80007080 can be divided by 91.

Step 1:
8 divided by 91 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 91

Moving on to step 2:
91 goes into 80 0 times with a remainder of 80.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 80, we get 80.
Bring next digit (0) of the dividend behind the 80 and repeat the process: 800 / 91

Advancing to step 3:
800 divided by 91 is 8 with a remainder of 72.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 72 after subtracting 728 from 800.
Fetch the next digit (0) from the dividend, attach it to 72 and continue: 720 / 91

Going ahead to step 4:
When dividing 720 by 91, we get 7 with a remainder of 83.
Use 7 as the next digit of our solution. 
Result so far: 87.0
The remainder is 83 after subtracting 637 from 720.
Bring next digit (7) of the dividend behind the 83 and repeat the process: 837 / 91

Moving on to step 5:
837 divided by 91 is 9 with a remainder of 18.
The next digit of our result is 9. 
Result so far: 879.0
Subtracting 819 from 837 leaves us with 18.
Take the next digit (0) from the dividend and append it to 18, then repeat: 180 / 91

Going ahead to step 6:
The number 91 fits into 180 1 times, leaving a remainder of 89.
Write down 1 as next digit of the result. 
Result so far: 8791.0
Subtract 91 from 180 to get 89.
Fetch the next digit (8) from the dividend, attach it to 89 and continue: 898 / 91

Going ahead to step 7:
91 goes into 898 9 times with a remainder of 79.
Put 9 as the next digit of the answer. 
Result so far: 87919.0
Deduct 819 from 898 and we're left with 79.
Append the next digit (0) from the dividend to 79 and continue with: 790 / 91

Going ahead to step 8:
91 goes into 790 8 times with a remainder of 62.
Record the quotient 8 as the next digit in the result. 
Result so far: 879198.0
The remainder is 62 after subtracting 728 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Moving on to step 9:
The number 91 fits into 620 6 times, leaving a remainder of 74.
Put 6 as the next digit of the answer. 
Result so far: 879198.6
Subtract 546 from 620 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 10:
91 goes into 740 8 times with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 879198.68
Subtract 728 from 740 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 11:
If we divide 120 by 91, we get 1 and a remainder of 29.
Write down 1 as next digit of the result. 
Result so far: 879198.681
If we subtract 91 from 120, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 12:
91 goes into 290 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 879198.6813
If we take 273 away from 290, 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.

Moving on to step 13:
When dividing 170 by 91, we get 1 with a remainder of 79.
The number 1 becomes the next digit in our result. 
Result so far: 879198.68131
If we subtract 91 from 170, we get 79.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

Step 14:
91 goes into 790 8 times with a remainder of 62.
Put 8 as the next digit of the answer. 
Result so far: 879198.681318
The remainder is 62 after subtracting 728 from 790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

On to step 15:
91 goes into 620 6 times with a remainder of 74.
Use 6 as the next digit of our solution. 
Result so far: 879198.6813186
The remainder is 74 after subtracting 546 from 620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Step 16:
740 divided by 91 is 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 879198.68131868
Subtract 728 from 740 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

After the division, we end up with 879198.68131868 and a remainder of 1.2e-08.