the principle is that of ordinary addition

Question

The principle is that of ordinary addition; however remember the highest number is 1.
 
Calculate the following:
 
                          11001 +
                          11010
 
Answer:
                            11001 +
                            11010
                            110011
 
Subtraction of binary is difficult, however uses 2 compliment it is easier.

Calculate the following:
 
                110011-
                11010
Answer:
 
Step One: Invert 11010 and add 1
 
        11010 -> 00101 + 1 = 00110
 
Step two: Replace -11010 with 00110 and add
 
            110011+
             00110
 
Step three: Remove msb         = 11001₂