3. Add without using number line : (a) 11 + (-7) (b) (-13) + (+18) (c) (-10) + (+ 19) (d) (-250) + (+ 150) (e) (-380) + (-270) (f) (-217) + (- 100)
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a.4 b. -5 c. -9 d.100 E.11O F.117
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