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Mathematics Question on Addition of Integers

Add without using number line :
(a) 11 + (- 7)
(b) (- 13) + (+ 18)
(c) (- 10) + (+ 19)
(d) (- 250) + (+ 150)
(e) (- 380) + (- 270)
(f) (- 217) + (- 100)

Answer

(a) 11+(–7)11+(–7)
=11−7= 11-7
=4= 4

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

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

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

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

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