3911 ÷ 5 = 782 R1
We're going to perform division on 3911 with 5 as the divisor.

Step 1:
5 goes into 3 0 times with a remainder of 3.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 3 to get 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 5

Step 2:
5 goes into 39 7 times with a remainder of 4.
Write down 7 as next digit of of the result. 
Result so far: 7
Subtract 35 from 39 to get 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 5

Step 3:
5 goes into 41 8 times with a remainder of 1.
Write down 8 as next digit of of the result. 
Result so far: 78
Subtract 40 from 41 to get 1.
Bring next digit (1) of the dividend behind the 1 and repeat the process: 11 / 5

Step 4:
5 goes into 11 2 times with a remainder of 1.
Write down 2 as next digit of of the result. 
Result so far: 782
Subtract 10 from 11 to get 1.

The final result is 782 with a remainder of 1.