3.  Add without using number line :

          (a) 11+(-7)

          (b)  (-13)+(+18)

          (c)  (-10)+(+19)
          (d)  (-250)+(+150)
          (e)  (-380)+(-270)
          (f)  (-217)+(-100)

Answers (2)

Addition without using the number line, in this method we have to split one number according to the other number such that a + (-a) = 0.

Now,  

(a) 11+(-7) = 4 + (7)+ (-7) = 4

 

(b)  (-13)+(+18) 
      = -13 + (13) + 5
      = 5

 

(c)  (-10)+(+19)
      = (- 10) + (10) + 9
      = 9

 

(d)  (-250)+(+150)
      = (- 100) + (- 150) + (150)
      = - 100

 

(e)  (-380)+(-270)
       = - (380 + 270 )
       = - 650

 

(f)  (-217)+(-100)
       = - (217 + 100)
       = - 317

11+(7)_

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