Example    4 

    Evaluate

      (a)     12 30

      (b)     6 (- 5)

       (c)   -7 (- 10)

 

       Solution

      (a)          12 30           =        12   +    (-30)

                                          =       -18

 

      (b)          6 (- 5)         =        6 +  (5)        

                                           =       11

 

       (c)         -7 (- 10)      =        -7   +  (10)        

                                           =         3

 

Exercise  3          

1.  Complete the following:

 

(a)    6 (- 16)      =

  

(e)     (-80)   20         =             

 

(b)    3 (- 11)       =       

 

(f)     (-8) (-16)        =                   

 

(c)   (-23)   33      =

 

(g)    (-44) (-16)       =                

 

(d)   (-40)   8       =

 

(h)    (-37) (-26)       =      

 

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