391913 ÷ 77 
We want to figure out the number of times 391913 can be divided by 77.

Advancing to step 1:
If we divide 3 by 77, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 77

Advancing to step 2:
The number 77 fits into 39 0 times, leaving a remainder of 39.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 39 after subtracting 0 from 39.
Include the next digit (1) from the dividend after 39, then repeat: 391 / 77

Going ahead to step 3:
If we divide 391 by 77, we get 5 and a remainder of 6.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 385 away from 391, we end up with 6.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 77

Advancing to step 4:
The number 77 fits into 69 0 times, leaving a remainder of 69.
The next digit of our result is 0. 
Result so far: 50.0
Subtract 0 from 69 to get 69.
Append the next digit (1) from the dividend to 69 and continue with: 691 / 77

Going ahead to step 5:
77 can be fit into 691 8 times, resulting in a remainder of 75.
The next digit of our result is 8. 
Result so far: 508.0
If we subtract 616 from 691, we get 75.
Append the next digit (3) from the dividend to 75 and continue with: 753 / 77

On to step 6:
If we divide 753 by 77, we get 9 and a remainder of 60.
Record the quotient 9 as the next digit in the result. 
Result so far: 5089.0
If we take 693 away from 753, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 7:
If we divide 600 by 77, we get 7 and a remainder of 61.
Use 7 as the next digit of our solution. 
Result so far: 5089.7
The remainder is 61 after subtracting 539 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

Advancing to step 8:
If we divide 610 by 77, we get 7 and a remainder of 71.
The next digit of our result is 7. 
Result so far: 5089.77
If we take 539 away from 610, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

The final result is 5089.77 with a remainder of 0.071.