4012 ÷ 5 = 802 R2
We're going to perform division on 4012 with 5 as the divisor.

Step 1:
5 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 4 to get 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 5

Step 2:
5 goes into 40 8 times with a remainder of 0.
Write down 8 as next digit of of the result. 
Result so far: 8
Subtract 40 from 40 to get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 5

Step 3:
5 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of of the result. 
Result so far: 80
Subtract 0 from 1 to get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 5

Step 4:
5 goes into 12 2 times with a remainder of 2.
Write down 2 as next digit of of the result. 
Result so far: 802
Subtract 10 from 12 to get 2.

The final result is 802 with a remainder of 2.