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

(a) 11 + (–7) = 11 – 7 = 4
(b) (–13) + 18 = 5
(c) (–10) + (+19) = –10 + 19 = 9
(d) (–250) + (+150) = –250 + 150 = –100
(e) (–380) + (–270) = –380 – 270 = –650
(f) (–217) + (–100) = –217 v 100 = –317

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