It is a very easy technique to divide any number by 9 with simple addition.
Step 1: Write 11 as given below by separating the last number by a line.
Step 2:Write the first digit of the divident as such.Add that 1 to the second number to obtain the remainder.
Step 3: 1 is the quotient and 2 is the remainder..
When the value of the remainder(11) is above is above the divisor(9).Perform the same above steps to 11
The quotient is obtained by adding 9+1=10
The remainder is 2