50 ÷ 9 = 5 R5
We're going to perform division on 50 with 9 as the divisor.

Step 1:
9 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of of the result. 
Result so far: 0
Subtract 0 from 5 to get 5.
Bring next digit (0) of the dividend behind the 5 and repeat the process: 50 / 9

Step 2:
9 goes into 50 5 times with a remainder of 5.
Write down 5 as next digit of of the result. 
Result so far: 5
Subtract 45 from 50 to get 5.

The final result is 5 with a remainder of 5.