5. Find the sum :

   (a) (-7)+(-9)+4+16

    (b) (37)+(-2)+(-65)+(-8)

Answers (1)

It is known that the sum of -a + (a) = 0
Therefore,
(a) (-7)+(-9)+4+16   
     = - (9 + 7) + 4 + 16
     =  (- 16) + 4 + 16
     = 4

Also we can split the 16 into (- 9 and -7 ).

 (b) (37)+(-2)+(-65)+(-8)
      = 37 + (- 37) + (- 28) + (-2) + (- 8)
      = 0 - (37 + 28 + 8)
      = - 73

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