77946688 divided by 91 
We want to divide 77946688 by 91.

Moving on to step 1:
If we divide 7 by 91, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 91

Going ahead to step 2:
91 goes into 77 0 times with a remainder of 77.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 77, we end up with 77.
Append the next digit (9) from the dividend to 77 and continue with: 779 / 91

Let's proceed to step 3:
91 can be fit into 779 8 times, resulting in a remainder of 51.
Write down 8 as next digit of the result. 
Result so far: 8.0
Subtracting 728 from 779 leaves us with 51.
Include the next digit (4) from the dividend after 51, then repeat: 514 / 91

Moving on to step 4:
The number 91 fits into 514 5 times, leaving a remainder of 59.
Use 5 as the next digit of our solution. 
Result so far: 85.0
Subtracting 455 from 514 leaves us with 59.
Grab the next digit (6) from the dividend, add it to 59, then carry on: 596 / 91

Advancing to step 5:
596 divided by 91 is 6 with a remainder of 50.
The number 6 becomes the next digit in our result. 
Result so far: 856.0
Subtracting 546 from 596 leaves us with 50.
Append the next digit (6) from the dividend to 50 and continue with: 506 / 91

Step 6:
The number 91 fits into 506 5 times, leaving a remainder of 51.
Write down 5 as next digit of the result. 
Result so far: 8565.0
Subtract 455 from 506 to get 51.
Include the next digit (8) from the dividend after 51, then repeat: 518 / 91

Step 7:
91 can be fit into 518 5 times, resulting in a remainder of 63.
Use 5 as the next digit of our solution. 
Result so far: 85655.0
If we subtract 455 from 518, we get 63.
Include the next digit (8) from the dividend after 63, then repeat: 638 / 91

Moving on to step 8:
638 divided by 91 is 7 with a remainder of 1.
Use 7 as the next digit of our solution. 
Result so far: 856557.0
If we subtract 637 from 638, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 9:
91 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 856557.0
Subtract 0 from 10 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:
When dividing 100 by 91, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 856557.01
The remainder is 9 after subtracting 91 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 11:
90 divided by 91 is 0 with a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 856557.01
If we subtract 0 from 90, we get 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Moving on to step 12:
When dividing 900 by 91, we get 9 with a remainder of 81.
Put 9 as the next digit of the answer. 
Result so far: 856557.0109
Subtracting 819 from 900 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Going ahead to step 13:
91 goes into 810 8 times with a remainder of 82.
Use 8 as the next digit of our solution. 
Result so far: 856557.01098
Subtracting 728 from 810 leaves us with 82.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

On to step 14:
91 goes into 820 9 times with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 856557.010989
If we subtract 819 from 820, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 15:
91 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 856557.010989
Deduct 0 from 10 and we're left 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.

Advancing to step 16:
91 goes into 100 1 times with a remainder of 9.
The next digit of our result is 1. 
Result so far: 856557.01098901
If we take 91 away from 100, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

The final outcome is 856557.01098901, with a leftover of 9e-09.